Design an Akari puzzle and share it with friends!
Click Validate and the page runs your grid through the exact same solver engine that powers the main game. The solver counts every solution your walls and numbers allow, and reports three outcomes:
Designing tip: the easiest way to build a valid puzzle is to start from a fully lit grid you have already solved, then delete clues one at a time and re-validate after every deletion. Only keep the deletions that still leave exactly one solution — that is the same clue-removal method the GridPaw puzzle generator uses for its own levels.
5×5 up to 10×10, with 7×7 selected by default. Each size keeps the same rule: numbered cells show how many of the 4 neighboring cells must hold a light.
Click a white cell to turn it into a black wall. Click that wall again to cycle its number 0 → 1 → 2 → 3 → 4; a fourth click removes the number, and right-click removes the wall entirely.
Everything runs in your browser tab — no account, no server. Your design only leaves the page when you click Get Link, which packs the full grid into a URL. Anyone who opens that link lands on this page with your puzzle already loaded, ready to solve.
The most common cause is a numbered wall that cannot be satisfied — for example, a "4" with fewer than four open neighbors. Validate always tells you whether the problem is no solution at all (clues contradict each other) or multiple solutions (not enough constraints).
