Click on the numbers, once to select, twice to hide or three times to restore them. The object of the puzzle is to shade in squares until the board complies with these three rules:
* No two numbers the same on any row or column
* No two filled-in squares side by side in a row or column
* When solved, all the empty squares must be joined together either left, right, up or down but diagonals don't count
You can use the circles to show numbers that you definitely don't want to shade. For help check the Hitori Toolbox
Hitori
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Wikipedia says that Hitori is an original puzzle from Nikoli and that it first appeared in Puzzle Communication Nikoli,
issue #29 in March 1990. It has been described as “Hotter than Sudoku, tougher than Kakuro”!
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