Free online Nurikabe puzzles with no ads and no sign-up. Play 5×5, 7×7, 10×10 and 12×12 grids or the daily puzzle, and every puzzle has exactly one solution. Your game auto-saves on phone and desktop, so you can stop and pick it up later, and a leaderboard tracks puzzles solved and the fastest 10×10 times. Tap to shade cells, mark islands with dots, undo, and press Check to see how many cells are wrong. Rule breaks light up as you play: a fully shaded 2×2 block, two islands touching, or an island grown past its number. How to play: shade the grid so that each number sits on an island of exactly that many unshaded cells, every island has exactly one number, islands never touch side by side, all shaded cells form one connected sea, and no 2×2 block is completely shaded.
How to play
Touch: tap a cell to cycle empty → shaded → dot → empty; the Shade/Dot button sets what a tap does. Undo and Check buttons below the grid. Keyboard: arrow keys move, Space shades, X or Enter dots, Backspace clears, D toggles mode, U undo, C check, Esc menu. Mouse: left click shades, right click dots.
New in v1.0
First release: 5×5 to 12×12 Nurikabe grids and a daily puzzle, each with exactly one solution. Tap to shade, dot marks, undo, a Check button, live rule warnings, auto-save and leaderboards.
