Exercises of the Xywing.

This theory is explained on this page .

2020/11/21 UP!　

NEWS

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level6(2020/9/30 up)

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Zero(2020/6/22 up)

For great expert.The Sudoku that one number cannot write.
animalsudoku(level_2,3,4,5)

Sudoku to use the illustration in substitution for a number.