[GUI] Per-game launch settings + shared SettingRow (#2) (#378)

Add per-game launch overrides (log level, import-trace limit, strict dynlib
resolution, log-to-file, and SHARPEMU_* environment toggles) with three-tier
resolution (per-game override -> global preference -> built-in default), stored
one file per game at user/custom_configs/<titleId>.json. Editable from a new
"Game settings..." context-menu dialog.

Introduce a shared SettingRow control and adopt it across the Options page and
the per-game dialog so the two read as one app. Fully localized (reusing the
existing Options.* keys), with the actions pinned in the dialog footer.

src/SharpEmu.GUI/App.axaml

@@ -5,6 +5,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
 
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:SharpEmu.GUI"
              x:Class="SharpEmu.GUI.App"
              RequestedThemeVariant="Dark">
 
@@ -32,6 +33,29 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <SolidColorBrush x:Key="InfoBrush" Color="#58A6FF" />
     <SolidColorBrush x:Key="TileHoverBrush" Color="#1A2130" />
     <SolidColorBrush x:Key="TileSelectedBrush" Color="#212A3F" />
+
+    <ControlTheme x:Key="{x:Type local:SettingRow}" TargetType="local:SettingRow">
+      <Setter Property="Template">
+        <ControlTemplate>
+          <Grid ColumnDefinitions="*,Auto">
+            <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+              <TextBlock x:Name="PART_Label" Text="{TemplateBinding Label}" FontSize="13" />
+              <TextBlock Text="{TemplateBinding Description}" FontSize="11"
+                         Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap"
+                         IsVisible="{Binding Description, RelativeSource={RelativeSource TemplatedParent},
+                                     Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
+            </StackPanel>
+            <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="10" VerticalAlignment="Center">
+              <ToggleSwitch OnContent="Override" OffContent="Override" MinWidth="0"
+                            VerticalAlignment="Center"
+                            IsVisible="{TemplateBinding ShowOverride}"
+                            IsChecked="{Binding IsOverridden, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" />
+              <ContentPresenter x:Name="PART_Slot" Content="{TemplateBinding Content}" VerticalAlignment="Center" />
+            </StackPanel>
+          </Grid>
+        </ControlTemplate>
+      </Setter>
+    </ControlTheme>
   </Application.Resources>
 
   <Application.Styles>

src/SharpEmu.GUI/Languages/en.json

@@ -15,6 +15,7 @@
   "Library.Context.OpenFolder": "Open game folder",
   "Library.Context.CopyPath": "Copy path",
   "Library.Context.CopyTitleId": "Copy title ID",
+  "Library.Context.GameSettings": "Game settings…",
   "Library.Context.Remove": "Remove from library",
 
   "Library.Empty.Title": "Your library is empty",
@@ -81,6 +82,13 @@
 
   "Common.On": "On",
   "Common.Off": "Off",
+  "Common.Save": "Save",
+  "Common.Cancel": "Cancel",
+
+  "PerGame.Title": "Per-game settings — {0} ({1})",
+  "PerGame.InheritNote": "Unchecked rows inherit the global defaults.",
+  "PerGame.EnvToggles.Label": "Environment toggles",
+  "PerGame.EnvToggles.Desc": "Override the global set of SHARPEMU_* switches for this game.",
 
   "Console.Title": "CONSOLE",
   "Console.SearchWatermark": "Search...",

src/SharpEmu.GUI/MainWindow.axaml

@@ -126,6 +126,13 @@ SPDX-License-Identifier: GPL-2.0-or-later
                   </MenuItem.Icon>
                 </MenuItem>
                 <Separator />
+                <MenuItem x:Name="CtxGameSettings" Header="Game settings…">
+                  <MenuItem.Icon>
+                    <TextBlock Text="⚙" FontSize="13" Foreground="{StaticResource MutedBrush}"
+                               HorizontalAlignment="Center" VerticalAlignment="Center" />
+                  </MenuItem.Icon>
+                </MenuItem>
+                <Separator />
                 <MenuItem x:Name="CtxRemove" Header="Remove from library"
                           Foreground="{StaticResource DangerHoverBrush}">
                   <MenuItem.Icon>
@@ -199,27 +206,19 @@ SPDX-License-Identifier: GPL-2.0-or-later
                     <StackPanel Spacing="14">
                       <TextBlock x:Name="EmulationSectionTitle" Classes="sectionTitle" Text="EMULATION" />
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="CpuEngineRow" Label="CPU engine"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Execution engine used to run game code.">
-                          <TextBlock x:Name="CpuEngineLabel" Text="CPU engine" FontSize="13" />
+                        <ComboBox x:Name="CpuEngineBox" Width="160" SelectedIndex="0"
-                          <TextBlock x:Name="CpuEngineDesc" Text="Execution engine used to run game code."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ComboBox Grid.Column="1" x:Name="CpuEngineBox" Width="160" SelectedIndex="0"
                                   VerticalAlignment="Center" CornerRadius="8">
                           <ComboBoxItem x:Name="CpuEngineNativeItem" Content="Native" />
                         </ComboBox>
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="StrictRow" Label="Strict dynlib resolution"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Fail the launch when an imported symbol cannot be resolved.">
-                          <TextBlock x:Name="StrictLabel" Text="Strict dynlib resolution" FontSize="13" />
+                        <ToggleSwitch x:Name="StrictToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="StrictDesc" Text="Fail the launch when an imported symbol cannot be resolved."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="StrictToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
                     </StackPanel>
                   </Border>
 
@@ -227,13 +226,9 @@ SPDX-License-Identifier: GPL-2.0-or-later
                     <StackPanel Spacing="14">
                       <TextBlock x:Name="LoggingSectionTitle" Classes="sectionTitle" Text="LOGGING" />
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="LogLevelRow" Label="Log level"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Verbosity of the emulator console output.">
-                          <TextBlock x:Name="LogLevelLabel" Text="Log level" FontSize="13" />
+                        <ComboBox x:Name="LogLevelBox" Width="160" SelectedIndex="2"
-                          <TextBlock x:Name="LogLevelDesc" Text="Verbosity of the emulator console output."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ComboBox Grid.Column="1" x:Name="LogLevelBox" Width="160" SelectedIndex="2"
                                   VerticalAlignment="Center" CornerRadius="8">
                           <ComboBoxItem x:Name="LogLevelTraceItem" Content="Trace" />
                           <ComboBoxItem x:Name="LogLevelDebugItem" Content="Debug" />
@@ -242,49 +237,32 @@ SPDX-License-Identifier: GPL-2.0-or-later
                           <ComboBoxItem x:Name="LogLevelErrorItem" Content="Error" />
                           <ComboBoxItem x:Name="LogLevelCriticalItem" Content="Critical" />
                         </ComboBox>
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="TraceImportsRow" Label="Import trace limit"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Trace the first N imports per module (0 = off).">
-                          <TextBlock x:Name="TraceImportsLabel" Text="Import trace limit" FontSize="13" />
+                        <NumericUpDown x:Name="TraceImportsBox" Width="160" Minimum="0"
-                          <TextBlock x:Name="TraceImportsDesc" Text="Trace the first N imports per module (0 = off)."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <NumericUpDown Grid.Column="1" x:Name="TraceImportsBox" Width="160" Minimum="0"
                                        Maximum="4096" Increment="16" Value="0" FormatString="0"
                                        VerticalAlignment="Center" CornerRadius="8" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="LogToFileRow" Label="Log to file"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Mirror emulator output to a log file.">
-                          <TextBlock x:Name="LogToFileLabel" Text="Log to file" FontSize="13" />
+                        <ToggleSwitch x:Name="LogToFileToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="LogToFileDesc" Text="Mirror emulator output to a log file."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="LogToFileToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="LogFilePathRow" Label="Log file path"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="No custom path">
-                          <TextBlock x:Name="LogFilePathLabel" Text="Log file path" FontSize="13" />
+                        <Button x:Name="SelectLogFilePathButton" Classes="ghost" Content="Select…"
-                          <TextBlock x:Name="LogFilePathText" Text="No custom path"
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <Button Grid.Column="1" x:Name="SelectLogFilePathButton" Classes="ghost" Content="Select…"
                                 VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="OverrideLogFileRow" Label="Override log file"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Use the exact file path instead of appending title ID and timestamp.">
-                          <TextBlock x:Name="OverrideLogFileLabel" Text="Override log file" FontSize="13" />
+                        <ToggleSwitch x:Name="OverrideLogFileToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="OverrideLogFileDesc"
-                                     Text="Use the exact file path instead of appending title ID and timestamp."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="OverrideLogFileToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
                     </StackPanel>
                   </Border>
 
@@ -292,47 +270,30 @@ SPDX-License-Identifier: GPL-2.0-or-later
                     <StackPanel Spacing="14">
                       <TextBlock x:Name="LauncherSectionTitle" Classes="sectionTitle" Text="LAUNCHER" />
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="LanguageRow" Label="Emulator language"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Language used throughout the launcher. Applies immediately.">
-                          <TextBlock x:Name="LanguageLabel" Text="Emulator language" FontSize="13" />
+                        <ComboBox x:Name="LanguageBox" Width="160"
-                          <TextBlock x:Name="LanguageDesc"
-                                     Text="Language used throughout the launcher. Applies immediately."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ComboBox Grid.Column="1" x:Name="LanguageBox" Width="160"
                                   VerticalAlignment="Center" CornerRadius="8"
                                   DisplayMemberBinding="{Binding NativeName}" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="TitleMusicRow" Label="Title music"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Loop the selected game's preview music in the library.">
-                          <TextBlock x:Name="TitleMusicLabel" Text="Title music" FontSize="13" />
+                        <ToggleSwitch x:Name="TitleMusicToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="TitleMusicDesc" Text="Loop the selected game's preview music in the library."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="TitleMusicToggle" OnContent="On" OffContent="Off"
                                       IsChecked="True" VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="DiscordRow" Label="Discord presence"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Show the running game on your Discord profile.">
-                          <TextBlock x:Name="DiscordLabel" Text="Discord presence" FontSize="13" />
+                        <ToggleSwitch x:Name="DiscordToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="DiscordDesc" Text="Show the running game on your Discord profile."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="DiscordToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="AutoUpdateRow" Label="Check for updates on startup"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Checks GitHub without delaying startup.">
-                          <TextBlock x:Name="AutoUpdateLabel" Text="Check for updates on startup" FontSize="13" />
+                        <ToggleSwitch x:Name="AutoUpdateToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="AutoUpdateDesc" Text="Checks GitHub without delaying startup."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="AutoUpdateToggle" OnContent="On" OffContent="Off"
                                       IsChecked="True" VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
                     </StackPanel>
                   </Border>
                   <Border Classes="card">
@@ -450,93 +411,53 @@ SPDX-License-Identifier: GPL-2.0-or-later
                                  Text="Switches passed to the emulator as environment variables at launch."
                                  FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvBthidRow" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_BTHID_UNAVAILABLE"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Report Bluetooth HID as unavailable for titles whose wheel/FFB middleware polls forever.&#10;Leave off normally. Some titles freeze when init fails.">
-                          <TextBlock Text="SHARPEMU_BTHID_UNAVAILABLE" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvBthidToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvBthidDesc"
-                                     Text="Report Bluetooth HID as unavailable for titles whose wheel/FFB middleware polls forever.&#10;Leave off normally. Some titles freeze when init fails."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvBthidToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvLoopGuardRow" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_DISABLE_IMPORT_LOOP_GUARD"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Do not force quit titles that repeat the same call for too long.&#10;Try this when a game exits on its own while loading.">
-                          <TextBlock Text="SHARPEMU_DISABLE_IMPORT_LOOP_GUARD" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvLoopGuardToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvLoopGuardDesc"
-                                     Text="Do not force quit titles that repeat the same call for too long.&#10;Try this when a game exits on its own while loading."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvLoopGuardToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvWritableApp0Row" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_WRITABLE_APP0"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Allow titles to create and write files inside their install folder.&#10;Needed by unpackaged dumps that write their save or config data under /app0.">
-                          <TextBlock Text="SHARPEMU_WRITABLE_APP0" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvWritableApp0Toggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvWritableApp0Desc"
-                                     Text="Allow titles to create and write files inside their install folder.&#10;Needed by unpackaged dumps that write their save or config data under /app0."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvWritableApp0Toggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvVkValidationRow" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_VK_VALIDATION"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Enable Vulkan validation layers for GPU debugging.&#10;Slow. Requires the Vulkan SDK to be installed.">
-                          <TextBlock Text="SHARPEMU_VK_VALIDATION" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvVkValidationToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvVkValidationDesc"
-                                     Text="Enable Vulkan validation layers for GPU debugging.&#10;Slow. Requires the Vulkan SDK to be installed."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvVkValidationToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvDumpSpirvRow" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_DUMP_SPIRV"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Dump AGC shaders and their SPIR-V translations to the shader-dumps folder.&#10;Use when reporting shader or rendering bugs.">
-                          <TextBlock Text="SHARPEMU_DUMP_SPIRV" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvDumpSpirvToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvDumpSpirvDesc"
-                                     Text="Dump AGC shaders and their SPIR-V translations to the shader-dumps folder.&#10;Use when reporting shader or rendering bugs."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvDumpSpirvToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvLogDirectMemoryRow" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_LOG_DIRECT_MEMORY"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Log direct memory allocations and failures to the console.&#10;Use when a game aborts or exits during boot.">
-                          <TextBlock Text="SHARPEMU_LOG_DIRECT_MEMORY" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvLogDirectMemoryToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvLogDirectMemoryDesc"
-                                     Text="Log direct memory allocations and failures to the console.&#10;Use when a game aborts or exits during boot."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvLogDirectMemoryToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvLogIoRow" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_LOG_IO"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Log file open, read, and path-resolve activity to the console.&#10;Use when a game cannot find its data files during boot.">
-                          <TextBlock Text="SHARPEMU_LOG_IO" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvLogIoToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvLogIoDesc"
-                                     Text="Log file open, read, and path-resolve activity to the console.&#10;Use when a game cannot find its data files during boot."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvLogIoToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
 
-                      <Grid ColumnDefinitions="*,Auto">
+                      <local:SettingRow x:Name="EnvLogNpRow" LabelFontFamily="Consolas,monospace" Label="SHARPEMU_LOG_NP"
-                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                                        Description="Log NP (PlayStation Network) library calls to the console.">
-                          <TextBlock Text="SHARPEMU_LOG_NP" FontSize="13" FontFamily="Consolas,monospace" />
+                        <ToggleSwitch x:Name="EnvLogNpToggle" OnContent="On" OffContent="Off"
-                          <TextBlock x:Name="EnvLogNpDesc"
-                                     Text="Log NP (PlayStation Network) library calls to the console."
-                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
-                        </StackPanel>
-                        <ToggleSwitch Grid.Column="1" x:Name="EnvLogNpToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
-                      </Grid>
+                      </local:SettingRow>
                     </StackPanel>
                   </Border>
 

src/SharpEmu.GUI/MainWindow.axaml.cs

@@ -104,6 +104,7 @@ public partial class MainWindow : Window
         string EbootPath,
         string DisplayName,
         string? TitleId,
+        string LogLevel,
         SharpEmuRuntimeOptions RuntimeOptions);
 
     public MainWindow()
@@ -204,6 +205,7 @@ public partial class MainWindow : Window
             await CopyToClipboardAsync((GameList.SelectedItem as GameEntry)?.Path, "Clipboard.Path");
         CtxCopyTitleId.Click += async (_, _) =>
             await CopyToClipboardAsync((GameList.SelectedItem as GameEntry)?.TitleId, "Clipboard.TitleId");
+        CtxGameSettings.Click += (_, _) => OpenSelectedGameSettings();
         CtxRemove.Click += (_, _) => RemoveSelectedFromLibrary();
 
         Opened += async (_, _) => await OnOpenedAsync();
@@ -573,6 +575,7 @@ public partial class MainWindow : Window
         CtxOpenFolder.Header = loc.Get("Library.Context.OpenFolder");
         CtxCopyPath.Header = loc.Get("Library.Context.CopyPath");
         CtxCopyTitleId.Header = loc.Get("Library.Context.CopyTitleId");
+        CtxGameSettings.Header = loc.Get("Library.Context.GameSettings");
         CtxRemove.Header = loc.Get("Library.Context.Remove");
 
         EmptyAddFolderButton.Content = loc.Get("Library.Empty.AddFolder");
@@ -582,27 +585,27 @@ public partial class MainWindow : Window
         EnvTabItem.Header = loc.Get("Options.Env.Tab");
         EnvSectionTitle.Text = loc.Get("Options.Section.Environment");
         EnvDesc.Text = loc.Get("Options.Env.Desc");
-        EnvBthidDesc.Text = loc.Get("Options.Env.Bthid.Desc");
+        EnvBthidRow.Description = loc.Get("Options.Env.Bthid.Desc");
-        EnvLoopGuardDesc.Text = loc.Get("Options.Env.LoopGuard.Desc");
+        EnvLoopGuardRow.Description = loc.Get("Options.Env.LoopGuard.Desc");
-        EnvWritableApp0Desc.Text = loc.Get("Options.Env.WritableApp0.Desc");
+        EnvWritableApp0Row.Description = loc.Get("Options.Env.WritableApp0.Desc");
-        EnvVkValidationDesc.Text = loc.Get("Options.Env.VkValidation.Desc");
+        EnvVkValidationRow.Description = loc.Get("Options.Env.VkValidation.Desc");
-        EnvDumpSpirvDesc.Text = loc.Get("Options.Env.DumpSpirv.Desc");
+        EnvDumpSpirvRow.Description = loc.Get("Options.Env.DumpSpirv.Desc");
-        EnvLogDirectMemoryDesc.Text = loc.Get("Options.Env.LogDirectMemory.Desc");
+        EnvLogDirectMemoryRow.Description = loc.Get("Options.Env.LogDirectMemory.Desc");
-        EnvLogIoDesc.Text = loc.Get("Options.Env.LogIo.Desc");
+        EnvLogIoRow.Description = loc.Get("Options.Env.LogIo.Desc");
-        EnvLogNpDesc.Text = loc.Get("Options.Env.LogNp.Desc");
+        EnvLogNpRow.Description = loc.Get("Options.Env.LogNp.Desc");
         EmulationSectionTitle.Text = loc.Get("Options.Section.Emulation");
         LoggingSectionTitle.Text = loc.Get("Options.Section.Logging");
         LauncherSectionTitle.Text = loc.Get("Options.Section.Launcher");
 
-        CpuEngineLabel.Text = loc.Get("Options.CpuEngine.Label");
+        CpuEngineRow.Label = loc.Get("Options.CpuEngine.Label");
-        CpuEngineDesc.Text = loc.Get("Options.CpuEngine.Desc");
+        CpuEngineRow.Description = loc.Get("Options.CpuEngine.Desc");
         CpuEngineNativeItem.Content = loc.Get("Options.CpuEngine.Native");
 
-        StrictLabel.Text = loc.Get("Options.Strict.Label");
+        StrictRow.Label = loc.Get("Options.Strict.Label");
-        StrictDesc.Text = loc.Get("Options.Strict.Desc");
+        StrictRow.Description = loc.Get("Options.Strict.Desc");
 
-        LogLevelLabel.Text = loc.Get("Options.LogLevel.Label");
+        LogLevelRow.Label = loc.Get("Options.LogLevel.Label");
-        LogLevelDesc.Text = loc.Get("Options.LogLevel.Desc");
+        LogLevelRow.Description = loc.Get("Options.LogLevel.Desc");
         LogLevelTraceItem.Content = loc.Get("Options.LogLevel.Trace");
         LogLevelDebugItem.Content = loc.Get("Options.LogLevel.Debug");
         LogLevelInfoItem.Content = loc.Get("Options.LogLevel.Info");
@@ -610,29 +613,29 @@ public partial class MainWindow : Window
         LogLevelErrorItem.Content = loc.Get("Options.LogLevel.Error");
         LogLevelCriticalItem.Content = loc.Get("Options.LogLevel.Critical");
 
-        TraceImportsLabel.Text = loc.Get("Options.TraceImports.Label");
+        TraceImportsRow.Label = loc.Get("Options.TraceImports.Label");
-        TraceImportsDesc.Text = loc.Get("Options.TraceImports.Desc");
+        TraceImportsRow.Description = loc.Get("Options.TraceImports.Desc");
 
-        LogToFileLabel.Text = loc.Get("Options.LogToFile.Label");
+        LogToFileRow.Label = loc.Get("Options.LogToFile.Label");
-        LogToFileDesc.Text = loc.Get("Options.LogToFile.Desc");
+        LogToFileRow.Description = loc.Get("Options.LogToFile.Desc");
 
-        LogFilePathLabel.Text = loc.Get("Options.LogFilePath.Label");
+        LogFilePathRow.Label = loc.Get("Options.LogFilePath.Label");
         SelectLogFilePathButton.Content = loc.Get("Options.LogFilePath.Select");
         UpdateLogFilePathText();
 
-        OverrideLogFileLabel.Text = loc.Get("Options.OverrideLogFile.Label");
+        OverrideLogFileRow.Label = loc.Get("Options.OverrideLogFile.Label");
-        OverrideLogFileDesc.Text = loc.Get("Options.OverrideLogFile.Desc");
+        OverrideLogFileRow.Description = loc.Get("Options.OverrideLogFile.Desc");
 
-        LanguageLabel.Text = loc.Get("Options.Language.Label");
+        LanguageRow.Label = loc.Get("Options.Language.Label");
-        LanguageDesc.Text = loc.Get("Options.Language.Desc");
+        LanguageRow.Description = loc.Get("Options.Language.Desc");
 
-        TitleMusicLabel.Text = loc.Get("Options.TitleMusic.Label");
+        TitleMusicRow.Label = loc.Get("Options.TitleMusic.Label");
-        TitleMusicDesc.Text = loc.Get("Options.TitleMusic.Desc");
+        TitleMusicRow.Description = loc.Get("Options.TitleMusic.Desc");
 
-        DiscordLabel.Text = loc.Get("Options.Discord.Label");
+        DiscordRow.Label = loc.Get("Options.Discord.Label");
-        DiscordDesc.Text = loc.Get("Options.Discord.Desc");
+        DiscordRow.Description = loc.Get("Options.Discord.Desc");
-        AutoUpdateLabel.Text = loc.Get("Updater.Auto.Label");
+        AutoUpdateRow.Label = loc.Get("Updater.Auto.Label");
-        AutoUpdateDesc.Text = loc.Get("Updater.Auto.Desc");
+        AutoUpdateRow.Description = loc.Get("Updater.Auto.Desc");
 
         foreach (var toggle in new[] { StrictToggle, LogToFileToggle, OverrideLogFileToggle, TitleMusicToggle, DiscordToggle, AutoUpdateToggle })
         {
@@ -952,7 +955,7 @@ public partial class MainWindow : Window
 
     private void UpdateLogFilePathText()
     {
-        LogFilePathText.Text = string.IsNullOrWhiteSpace(_settings.LogFilePath)
+        LogFilePathRow.Description = string.IsNullOrWhiteSpace(_settings.LogFilePath)
             ? Localization.Instance.Get("Options.LogFilePath.Default")
             : _settings.LogFilePath;
     }
@@ -1379,6 +1382,25 @@ public partial class MainWindow : Window
         GameList.SelectedItem = game;
         CtxLaunch.IsEnabled = !_isRunning;
         CtxCopyTitleId.IsEnabled = game.TitleId is not null;
+        CtxGameSettings.IsEnabled = !string.IsNullOrWhiteSpace(game.TitleId);
+    }
+
+    private void OpenSelectedGameSettings()
+    {
+        if (GameList.SelectedItem is not GameEntry game)
+        {
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(game.TitleId))
+        {
+            AppendConsoleLine(
+                "[GUI][WARN] Per-game settings require a title ID, which this game does not have.",
+                WarningLineBrush);
+            return;
+        }
+
+        _ = new PerGameSettingsDialog(game.TitleId, game.Name, _settings).ShowDialog(this);
     }
 
     private void OpenSelectedGameFolder()
@@ -1671,34 +1693,39 @@ public partial class MainWindow : Window
             return;
         }
 
+        var resolvedTitleId = string.IsNullOrWhiteSpace(titleId)
+            ? _allGames.FirstOrDefault(game => game.Path.Equals(ebootPath, FilePathComparison))?.TitleId
+            : titleId;
+        var effective = EffectiveLaunchSettings.Resolve(_settings, PerGameSettings.Load(resolvedTitleId));
+
         _sndPreview.Stop();
         _consoleLines.Clear();
         _allConsoleLines.Clear();
 
         DropFileLog();
-        if (_settings.LogToFile)
+        if (effective.LogToFile)
         {
-            OpenFileLog(titleId);
+            OpenFileLog(resolvedTitleId);
         }
 
         // The isolated game child inherits these diagnostics. Keep them on the
         // launcher process so every platform receives the same launch options.
         foreach (var staleName in _appliedEnvironmentVariables)
         {
-            if (!_settings.EnvironmentToggles.Contains(staleName))
+            if (!effective.EnvironmentToggles.Contains(staleName))
             {
                 Environment.SetEnvironmentVariable(staleName, null);
             }
         }
 
         _appliedEnvironmentVariables.Clear();
-        foreach (var name in _settings.EnvironmentToggles)
+        foreach (var name in effective.EnvironmentToggles)
         {
             Environment.SetEnvironmentVariable(name, "1");
             _appliedEnvironmentVariables.Add(name);
         }
 
-        if (SharpEmuLog.TryParseLevel(_settings.LogLevel, out var logLevel))
+        if (SharpEmuLog.TryParseLevel(effective.LogLevel, out var logLevel))
         {
             SharpEmuLog.MinimumLevel = logLevel;
         }
@@ -1706,15 +1733,14 @@ public partial class MainWindow : Window
         var runtimeOptions = new SharpEmuRuntimeOptions
         {
             CpuEngine = CpuExecutionEngine.NativeOnly,
-            StrictDynlibResolution = _settings.StrictDynlibResolution,
+            StrictDynlibResolution = effective.StrictDynlibResolution,
-            ImportTraceLimit = Math.Max(0, _settings.ImportTraceLimit),
+            ImportTraceLimit = Math.Max(0, effective.ImportTraceLimit),
         };
 
         _isRunning = true;
         _runningGameName = displayName;
         SessionGameTitle.Text = displayName;
-        _runningGameTitleId = titleId ?? _allGames
+        _runningGameTitleId = resolvedTitleId;
-            .FirstOrDefault(game => game.Path.Equals(ebootPath, FilePathComparison))?.TitleId;
         _runningSinceUnixSeconds = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
         StatusDot.Fill = SuccessLineBrush;
         StatusText.Text = Localization.Instance.Format("Launch.Running", displayName);
@@ -1727,6 +1753,7 @@ public partial class MainWindow : Window
             Path.GetFullPath(ebootPath),
             displayName,
             _runningGameTitleId,
+            effective.LogLevel,
             runtimeOptions);
 
         if (_gameSurfaceHost?.Surface is { } surface)
@@ -1895,7 +1922,7 @@ public partial class MainWindow : Window
         var arguments = new List<string>
         {
             "--cpu-engine=native",
-            $"--log-level={_settings.LogLevel}",
+            $"--log-level={launch.LogLevel}",
         };
         if (launch.RuntimeOptions.StrictDynlibResolution)
         {

src/SharpEmu.GUI/PerGameSettings.cs

@@ -0,0 +1,115 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace SharpEmu.GUI;
+
+public sealed class PerGameSettings
+{
+    private static readonly JsonSerializerOptions SerializerOptions = new()
+    {
+        WriteIndented = true,
+    };
+
+    public string? LogLevel { get; set; }
+
+    public int? ImportTraceLimit { get; set; }
+
+    public bool? StrictDynlibResolution { get; set; }
+
+    public bool? LogToFile { get; set; }
+
+    public List<string>? EnvironmentToggles { get; set; }
+
+    [JsonIgnore]
+    public bool IsEmpty =>
+        LogLevel is null &&
+        ImportTraceLimit is null &&
+        StrictDynlibResolution is null &&
+        LogToFile is null &&
+        EnvironmentToggles is null;
+
+    public static string DirectoryPath =>
+        Path.Combine(AppContext.BaseDirectory, "user", "custom_configs");
+
+    public static string PathFor(string titleId) =>
+        Path.Combine(DirectoryPath, SanitizeTitleId(titleId) + ".json");
+
+    public static PerGameSettings? Load(string? titleId)
+    {
+        if (string.IsNullOrWhiteSpace(titleId))
+        {
+            return null;
+        }
+
+        try
+        {
+            var path = PathFor(titleId);
+            if (File.Exists(path))
+            {
+                return JsonSerializer.Deserialize<PerGameSettings>(File.ReadAllText(path), SerializerOptions);
+            }
+        }
+        catch (Exception)
+        {
+        }
+
+        return null;
+    }
+
+    public void Save(string titleId)
+    {
+        if (string.IsNullOrWhiteSpace(titleId))
+        {
+            return;
+        }
+
+        try
+        {
+            var path = PathFor(titleId);
+            if (IsEmpty)
+            {
+                if (File.Exists(path))
+                {
+                    File.Delete(path);
+                }
+
+                return;
+            }
+
+            Directory.CreateDirectory(DirectoryPath);
+            File.WriteAllText(path, JsonSerializer.Serialize(this, SerializerOptions));
+        }
+        catch (Exception)
+        {
+        }
+    }
+
+    private static string SanitizeTitleId(string titleId)
+    {
+        var trimmed = titleId.Trim();
+        foreach (var invalid in Path.GetInvalidFileNameChars())
+        {
+            trimmed = trimmed.Replace(invalid, '_');
+        }
+
+        return trimmed.Length == 0 ? "UNKNOWN" : trimmed;
+    }
+}
+
+public sealed record EffectiveLaunchSettings(
+    string LogLevel,
+    int ImportTraceLimit,
+    bool StrictDynlibResolution,
+    bool LogToFile,
+    IReadOnlyList<string> EnvironmentToggles)
+{
+    public static EffectiveLaunchSettings Resolve(GuiSettings global, PerGameSettings? perGame) => new(
+        perGame?.LogLevel ?? global.LogLevel,
+        perGame?.ImportTraceLimit ?? global.ImportTraceLimit,
+        perGame?.StrictDynlibResolution ?? global.StrictDynlibResolution,
+        perGame?.LogToFile ?? global.LogToFile,
+        perGame?.EnvironmentToggles ?? global.EnvironmentToggles);
+}

src/SharpEmu.GUI/PerGameSettingsDialog.cs

@@ -0,0 +1,205 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Layout;
+using Avalonia.Media;
+
+namespace SharpEmu.GUI;
+
+public sealed class PerGameSettingsDialog : Window
+{
+    private static readonly string[] LogLevels =
+        { "Trace", "Debug", "Info", "Warning", "Error", "Critical" };
+
+    private static readonly string[] EnvToggles =
+    {
+        "SHARPEMU_BTHID_UNAVAILABLE",
+        "SHARPEMU_DISABLE_IMPORT_LOOP_GUARD",
+        "SHARPEMU_WRITABLE_APP0",
+        "SHARPEMU_VK_VALIDATION",
+        "SHARPEMU_DUMP_SPIRV",
+        "SHARPEMU_LOG_DIRECT_MEMORY",
+        "SHARPEMU_LOG_IO",
+        "SHARPEMU_LOG_NP",
+    };
+
+    private readonly string _titleId;
+
+    private readonly SettingRow _logLevelRow;
+    private readonly ComboBox _logLevel = new() { ItemsSource = LogLevels, Width = 160 };
+
+    private readonly SettingRow _traceRow;
+    private readonly NumericUpDown _trace = new()
+    {
+        Minimum = 0, Maximum = 4096, Increment = 16, Width = 160, FormatString = "0",
+    };
+
+    private readonly SettingRow _strictRow;
+    private readonly ToggleSwitch _strict = new();
+
+    private readonly SettingRow _logToFileRow;
+    private readonly ToggleSwitch _logToFile = new();
+
+    private readonly SettingRow _envRow;
+    private readonly StackPanel _envList = new() { Orientation = Orientation.Vertical, Spacing = 8, Margin = new(0, 4, 0, 0) };
+    private readonly List<(string Name, ToggleSwitch Box)> _envBoxes = new();
+
+    public PerGameSettingsDialog(string titleId, string displayName, GuiSettings global)
+    {
+        _titleId = titleId;
+        var loc = Localization.Instance;
+
+        Title = loc.Format("PerGame.Title", displayName, titleId);
+        Width = 520;
+        MaxHeight = 720;
+        SizeToContent = SizeToContent.Height;
+        WindowStartupLocation = WindowStartupLocation.CenterOwner;
+        CanResize = false;
+
+        Background = new SolidColorBrush(Color.Parse("#0D1017"));
+
+        _strict.OnContent = _logToFile.OnContent = loc.Get("Common.On");
+        _strict.OffContent = _logToFile.OffContent = loc.Get("Common.Off");
+
+        _logLevelRow = Row(loc.Get("Options.LogLevel.Label"), loc.Get("Options.LogLevel.Desc"), _logLevel);
+        _traceRow = Row(loc.Get("Options.TraceImports.Label"), loc.Get("Options.TraceImports.Desc"), _trace);
+        _strictRow = Row(loc.Get("Options.Strict.Label"), loc.Get("Options.Strict.Desc"), _strict);
+        _logToFileRow = Row(loc.Get("Options.LogToFile.Label"), loc.Get("Options.LogToFile.Desc"), _logToFile);
+        _envRow = new SettingRow
+        {
+            Label = loc.Get("PerGame.EnvToggles.Label"),
+            Description = loc.Get("PerGame.EnvToggles.Desc"),
+            ShowOverride = true,
+        };
+
+        foreach (var name in EnvToggles)
+        {
+            var box = new ToggleSwitch { OnContent = name, OffContent = name };
+            _envBoxes.Add((name, box));
+            _envList.Children.Add(box);
+        }
+
+        var content = new StackPanel { Orientation = Orientation.Vertical, Spacing = 12, Margin = new(16) };
+        content.Children.Add(new TextBlock
+        {
+            Text = loc.Get("PerGame.InheritNote"),
+            Foreground = new SolidColorBrush(Color.Parse("#8B94A7")),
+            FontSize = 12,
+        });
+        content.Children.Add(Card(loc.Get("Options.Section.Emulation"), _strictRow));
+        content.Children.Add(Card(loc.Get("Options.Section.Logging"), _logLevelRow, _traceRow, _logToFileRow));
+        content.Children.Add(Card(loc.Get("Options.Section.Environment"), _envRow, _envList));
+
+        var save = new Button { Content = loc.Get("Common.Save"), Classes = { "accent" } };
+        var cancel = new Button { Content = loc.Get("Common.Cancel"), Classes = { "ghost" } };
+        save.Click += (_, _) => { Persist(); Close(); };
+        cancel.Click += (_, _) => Close();
+
+        var buttonBar = new Border
+        {
+            BorderBrush = new SolidColorBrush(Color.Parse("#8B94A7")) { Opacity = 0.25 },
+            BorderThickness = new Thickness(0, 1, 0, 0),
+            Padding = new(16),
+            Child = new StackPanel
+            {
+                Orientation = Orientation.Horizontal,
+                Spacing = 8,
+                HorizontalAlignment = HorizontalAlignment.Right,
+                Children = { cancel, save },
+            },
+        };
+
+        var root = new Grid { RowDefinitions = new RowDefinitions("*,Auto") };
+        var scroller = new ScrollViewer { Content = content };
+        Grid.SetRow(scroller, 0);
+        Grid.SetRow(buttonBar, 1);
+        root.Children.Add(scroller);
+        root.Children.Add(buttonBar);
+        Content = root;
+
+        LoadValues(global);
+        _envRow.PropertyChanged += (_, e) =>
+        {
+            if (e.Property == SettingRow.IsOverriddenProperty)
+            {
+                _envList.IsEnabled = _envRow.IsOverridden;
+            }
+        };
+        _envList.IsEnabled = _envRow.IsOverridden;
+    }
+
+    private static SettingRow Row(string label, string description, Control value) => new()
+    {
+        Label = label,
+        Description = description,
+        ShowOverride = true,
+        Content = value,
+    };
+
+    private static Border Card(string title, params Control[] rows)
+    {
+        var stack = new StackPanel { Orientation = Orientation.Vertical, Spacing = 14 };
+        stack.Children.Add(new TextBlock { Text = title, Classes = { "sectionTitle" } });
+        foreach (var row in rows)
+        {
+            stack.Children.Add(row);
+        }
+
+        var card = new Border { Child = stack };
+        card.Classes.Add("card");
+        return card;
+    }
+
+    private void LoadValues(GuiSettings global)
+    {
+        _logLevel.SelectedItem = Array.IndexOf(LogLevels, global.LogLevel) >= 0 ? global.LogLevel : "Info";
+        _trace.Value = global.ImportTraceLimit;
+        _strict.IsChecked = global.StrictDynlibResolution;
+        _logToFile.IsChecked = global.LogToFile;
+        foreach (var (name, box) in _envBoxes)
+        {
+            box.IsChecked = global.EnvironmentToggles.Contains(name);
+        }
+
+        var existing = PerGameSettings.Load(_titleId);
+        if (existing is null)
+        {
+            return;
+        }
+
+        if (existing.LogLevel is { } level && Array.IndexOf(LogLevels, level) >= 0)
+        {
+            _logLevelRow.IsOverridden = true;
+            _logLevel.SelectedItem = level;
+        }
+
+        if (existing.ImportTraceLimit is { } t) { _traceRow.IsOverridden = true; _trace.Value = t; }
+        if (existing.StrictDynlibResolution is { } s) { _strictRow.IsOverridden = true; _strict.IsChecked = s; }
+        if (existing.LogToFile is { } l) { _logToFileRow.IsOverridden = true; _logToFile.IsChecked = l; }
+        if (existing.EnvironmentToggles is { } env)
+        {
+            _envRow.IsOverridden = true;
+            foreach (var (name, box) in _envBoxes)
+            {
+                box.IsChecked = env.Contains(name);
+            }
+        }
+    }
+
+    private void Persist()
+    {
+        var settings = new PerGameSettings
+        {
+            LogLevel = _logLevelRow.IsOverridden ? _logLevel.SelectedItem as string : null,
+            ImportTraceLimit = _traceRow.IsOverridden ? (int)(_trace.Value ?? 0) : null,
+            StrictDynlibResolution = _strictRow.IsOverridden ? _strict.IsChecked == true : null,
+            LogToFile = _logToFileRow.IsOverridden ? _logToFile.IsChecked == true : null,
+            EnvironmentToggles = _envRow.IsOverridden
+                ? _envBoxes.Where(e => e.Box.IsChecked == true).Select(e => e.Name).ToList()
+                : null,
+        };
+        settings.Save(_titleId);
+    }
+}

src/SharpEmu.GUI/SettingRow.cs

@@ -0,0 +1,101 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Presenters;
+using Avalonia.Controls.Primitives;
+using Avalonia.Data;
+using Avalonia.Media;
+
+namespace SharpEmu.GUI;
+
+public sealed class SettingRow : ContentControl
+{
+    public static readonly StyledProperty<string?> LabelProperty =
+        AvaloniaProperty.Register<SettingRow, string?>(nameof(Label));
+
+    public static readonly StyledProperty<string?> DescriptionProperty =
+        AvaloniaProperty.Register<SettingRow, string?>(nameof(Description));
+
+    public static readonly StyledProperty<bool> ShowOverrideProperty =
+        AvaloniaProperty.Register<SettingRow, bool>(nameof(ShowOverride));
+
+    public static readonly StyledProperty<bool> IsOverriddenProperty =
+        AvaloniaProperty.Register<SettingRow, bool>(
+            nameof(IsOverridden), defaultBindingMode: BindingMode.TwoWay);
+
+    public static readonly StyledProperty<FontFamily?> LabelFontFamilyProperty =
+        AvaloniaProperty.Register<SettingRow, FontFamily?>(nameof(LabelFontFamily));
+
+    private ContentPresenter? _slot;
+    private TextBlock? _label;
+
+    public string? Label
+    {
+        get => GetValue(LabelProperty);
+        set => SetValue(LabelProperty, value);
+    }
+
+    public string? Description
+    {
+        get => GetValue(DescriptionProperty);
+        set => SetValue(DescriptionProperty, value);
+    }
+
+    public bool ShowOverride
+    {
+        get => GetValue(ShowOverrideProperty);
+        set => SetValue(ShowOverrideProperty, value);
+    }
+
+    public bool IsOverridden
+    {
+        get => GetValue(IsOverriddenProperty);
+        set => SetValue(IsOverriddenProperty, value);
+    }
+
+    public FontFamily? LabelFontFamily
+    {
+        get => GetValue(LabelFontFamilyProperty);
+        set => SetValue(LabelFontFamilyProperty, value);
+    }
+
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+    {
+        base.OnApplyTemplate(e);
+        _slot = e.NameScope.Find<ContentPresenter>("PART_Slot");
+        _label = e.NameScope.Find<TextBlock>("PART_Label");
+        UpdateSlotEnabled();
+        UpdateLabelFont();
+    }
+
+    protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+    {
+        base.OnPropertyChanged(change);
+        if (change.Property == ShowOverrideProperty || change.Property == IsOverriddenProperty)
+        {
+            UpdateSlotEnabled();
+        }
+        else if (change.Property == LabelFontFamilyProperty)
+        {
+            UpdateLabelFont();
+        }
+    }
+
+    private void UpdateLabelFont()
+    {
+        if (_label is not null && LabelFontFamily is { } family)
+        {
+            _label.FontFamily = family;
+        }
+    }
+
+    private void UpdateSlotEnabled()
+    {
+        if (_slot is not null)
+        {
+            _slot.IsEnabled = !ShowOverride || IsOverridden;
+        }
+    }
+}