Dodot

You place two-coloured dots on a board where no three dots of the same colour sit side by side, the colours are evenly distributed in every row and column, and no row or column is a copy of another. The game has a daily puzzle, a free-size mode and a time-attack mode. It runs in the browser without needing any server. Highlights: Every mode uses the same three rules; in time-attack mode each solved board earns you time. A single-file app with no dependencies. An installable PWA that works offline.