When a Slitherlink board feels stuck, return to patterns instead of guessing.
- 0 or 2 at every point — the foundation of almost every deduction.
- Corner 1 / 2 / 3 — edges of the grid are constrained; corners even more so.
- Adjacent 3s — shared edges and the classic “S” wrap.
- 3 next to 0 — nearly fills the 3 automatically.
- Diagonal 3s — outer edges often fill even when the pearls don’t touch orthogonally.
Read the full walkthrough in our How to Play Slitherlink guide, then practice in the Slitherlink app.