Slitherlink

Draw one closed loop along the dots so every clue counts its edges.

  1. Tap between two dots to draw a line. Tap again to mark an × (no line here). Tap 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.

A tiny board you can experiment on.

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