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Hitori is a game about numbers. It is a logic puzzle. Game contains thousand puzzles of various sizes and mixed difficulty. Sizes of the puzzles are from 5x5 to 14x14.
Rules of the game:
In the game of Hitori the goal is to remove repeating numbers from rows and columns with two additional rules:
1) You can't remove adjacent numbers.
2) Remaining number have to form a continuous area. (Imagine you are cutting out the squares with scissors out of a paper puzzle and after you cut out all of them, the puzzle has to be a single piece of paper.)
Single tap removes the number. Second tap will circle the number and it can be used to mark a number that you don't want to remove.
In the application you can find information about game rules and solving techniques.