Slitherlink
Draw a single closed loop. Numbers count their edges.
▶ Play SlitherlinkAbout
Classic Slitherlink on a 7×7 cell grid (8×8 dot lattice). Draw a single closed loop along cell edges — no branches, no crossings, no ends. Each numbered cell constrains exactly that many of its four edges to lie on the loop. Generated puzzles are verified to have a unique solution.
How to play
Click an edge midpoint to cycle blank → drawn → X (denial mark) → blank. Or use arrow keys to move a cursor between edges and Enter to cycle the highlighted edge. Each digit constrains its cell to that many drawn edges. You win when the drawn edges form exactly one closed loop with no branches, no crossings, and no dangling ends.
Features
- 7×7 cell grid (8×8 dot lattice)
- Mixed deduction depths — ~40% pure-deduction easy, ~10% lookahead hard
- Unique-solution generation
- Three-state edges: drawn / X / blank
- Mouse and keyboard input
- Palette-strict two-color rendering