“Slitherlink" is a number game equal to Sudoku

HOW TO PLAY?
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1. The board consists of a number of numbers and a number of points. Each number represents the number of Square around it.

2. Connect points to points in a straight line, making it a loop and only one loop. The number between four points represents the number of lines around its square.

3. Where there are no numbers, there is no limit to the number of underscores, and there can be no underscores around 0. The routes must not cross, nor be forked.

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