Solitr isn't a single solitaire game. Instead of one version of the Solitaire card game, it features several games accessed via tabs on one game screen. A player can use the screen to try their hand at the Solitaire (Klondike) or Spider card games, a Mahjong tile-matching game or a Sudoku logic-based, 9x9 numbers game.
With Solitaire, the player's objective is to transfer cards from vertical columns to a foundation area. They must reorder the face-up and face-down cards into non-suit, descending, sequential (K, Q, J, 10, 9...) columns to build suit-based, ascending, sequential (A, 2, 3, 4, 5...) piles in the foundation. They use a one- or three-draw option with a draw pile to help them make their builds.
With Spider, the player creates eight columns by reordering face-up, face-down and draw-pile cards into descending (K, Q, J...3, 2, A) columns. Depending on their chosen difficulty level, they might build based on one or several suits. If the player uses draw-pile cards, they must attempt to reorder around a new card added to every column build.
With Mahjong, the player must remove all layered tiles from the playfield by matching two identical tiles at a time. They can only match uncovered tiles with at least one right or left open side. The game supplies them with useful Hint, Undo and Reshuffle tools.
Lastly, to win Sudoku, the player must fill nine subgrids with numbers 1 though 9 without repeating the same pattern across subgrids or any numbers within a subgrid. The game offers Easy, Medium, Hard and Very Hard gameplay. It also features a Help menu with tips.
