Free online chaos sudoku — jigsaw sudoku with nine irregular regions instead of 3×3 boxes.
Every row, every column and every coloured region must contain the digits 1 to 9 exactly once. In Chaos sudoku the nine regions are irregular jigsaw shapes instead of the usual 3×3 boxes, so you read them from the colours.
In Double Chaos, the same puzzle appears in two grids with different region layouts that share a single solution — you need clues from both grids to crack it.
Play free in your browser, no account needed. Sign in for the daily puzzle and the daily and weekly leaderboards.