Nurikabe

Restore the Tidal Archive

Mark every cell as sanctuary island or flood. Each numbered beacon belongs to one island of exactly that size; every island holds one beacon, while the flood stays connected and never forms a solid 2×2 pool.

All 120 charts are open, from gentle 5×5 lessons to 8×8 archive charts. Every chart has exactly one enumerated answer, replayed and checked against all four rules during every build. Each keeps a named public fastest time and top ten.