Hitori (Japanese: literally "leave me alone") is a type of logic puzzle published by Nikoli.

Rules

Hitori is played with a grid of squares or cells, with each cell initially containing a number. The game is played by eliminating squares/numbers and this is done by blacking them out. The objective is to transform the grid to a state wherein all three following rules are true:

• no row or column can have more than one occurrence of any given number
• black cells cannot be horizontally or vertically adjacent, although they can be diagonal to one another.
• the remaining numbered cells must be all connected to each other, horizontally or vertically. Wikipedia article

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