• Gattai is a Japanese word meaning merged or fused; this term is used for overlapping sudoku. A number after the word "Gattai" indicates how many 9 x 9 sudokus are in the puzzle .
  • Keyboard Touch screen
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    In order to get the best gaming experience on smart devices such as smartphones or ipads, the touch screen mode is preferred. On your PC, you can choose keyboard mode or touch screen mode according to your preference.


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