

Use the built-in color themes as reference. To maximize the visibility of custom themes, prefer darker interface colors on lighter background colors and vice-versa.Clicking the “Reset theme” button would do the same for all colors (i.e., it would make Custom theme 1 look exactly like the Dark theme). Using the example from the image above, clicking the “Reset color” button would make the background color of Custom theme 1 match the background color of the Dark theme. Click the “Reset color” button to apply the equivalent color from the selected preset into this theme. Use the arrow buttons to pick between different themes (this will not have any effect by itself). Presets: This toolbar allows you to quickly reuse colors from different themes.Brightness: Changes the brightness of the currently selected color, i.e., the amount of light emitted by the color, with values closer to 0 representing less light (pure black).Saturation: Changes the saturation of the currently selected color, i.e., the intensity or “colorfulness” of the color, with values closer to 0 representing less intensity (pure white).Hue: Changes the hue of the currently selected color.You can click the buttons continuously to undo/redo faster. This history will only be lost when you exit the game. The undo/redo history is always preserved while the game is open, even after changing themes or closing the options menu, up to a maximum of 100 actions.

Undo and redo: Allows you to undo/redo all changes applied to the color theme that is currently being edited (since the game was started).When you pick a root color for editing, the preview window will automatically display that color inside the “X” cell. You can edit the background color, interface color and root colors 1 to 9 (root colors are those associated to each different cell marked with an “X” on the puzzle). Color selector: This lets you pick the color to be edited.Preview: This window allows you to see what the color theme will look like while you are playing.For example, if “Swap themes” is set to “Every puzzle” and you are playing puzzle 1, the dot will appear before “Color theme A”, while on puzzle 2 it will appear before “Color theme B”. This handy indicator shows that, for the current puzzle (and according to the current “Swap theme” setting), this is the theme that is being presented. Looking at the image above, you can see a small dot before the words “Color theme A”.Setting “Color theme B” to the same theme as “Color theme A” is effectively the same as setting “Swap themes” to “Disabled”.By default, these themes look exactly like the Dark theme until you make any changes. These themes can be edited freely by clicking the “Edit” button, which brings up the color theme editor. Additionally, you have 5 custom theme slots. You can choose from several built-in themes, including options for color blindness. These settings allow you to choose which color themes will be presented.Accepted values: Dark (default for color theme A), Light (default for color theme B), Wine, Cool, Rosy, Desert, Deuteranopia (green cone color blindness), Protanopia (red cone color blindness), Tritanopia (blue cone color blindness), Custom 1 to 5.If you set this to “Disabled”, only color theme A will be used (i.e., color themes will never be swapped). You can change the interval at which color themes will be swapped, up to a maximum of 20 puzzles (i.e., puzzles 1 to 20 will use color theme A, puzzles 21 to 40 will use color theme B, and so on). Its default value is “Every puzzle”, which means that color themes will be swapped every time the puzzle is changed (i.e., puzzle 1 will use color theme A, puzzle 2 will use color theme B, puzzle 3 will use color theme A, puzzle 4 will use color theme B, and so on). This setting allows you to define how often color themes will be swapped.Accepted values: Disabled, Every puzzle (default), Every 2…20 puzzles.The options “Swap themes”, “Color theme A” and “Color theme B” allow you to choose what themes are presented during gameplay.
