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Microsoft Solitaire Collection, Mahjong by Microsoft mobile edition, and Microsoft Sudoku mobile edition each offer a Dark mode as one of the many themes within the game.
To use this mode in Microsoft Solitaire Collection, navigate to Themes and select Dark or Jumbo Dark.
You can also select Dark as a background, card back, and card front separately when you create a custom theme using the menu above Standard Themes.
In Mahjong by Microsoft mobile edition, navigate to Themes and there you can choose tiles with a Dark background under the Tile tab. You also have the option to select a darker, static background by navigating to the Background tab.
In Microsoft Sudoku on mobile, navigate to Themes and toggle the switch for Dark Mode.
Note: When this option is toggled, it will override any other theme that you have selected prior to choosing dark mode.