Slitherlink

1. Drag along the dots to draw the loop, line by line. Or tap between two dots: once for a line, again for an × (no line here), once more to clear.
2. Each number says how many of the four edges around it are part of the loop: a 0 has none, a 3 has three.
3. The lines must form one single closed loop.
4. The loop never crosses or touches itself: every dot touches zero or two lines.
5. Cells without a number can have any count of loop edges.

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