Fill every row, column, and 3×3 box with the digits 1–9. No repeats allowed anywhere!
Both main diagonals (top-left→bottom-right and top-right→bottom-left) must also each contain 1–9 exactly once.
The standard 3×3 boxes are replaced by 9 irregular coloured regions. Each coloured region must contain 1–9.
Highlights any incorrect entries in red. Correct entries are untouched.
Variant Sudoku is a logic puzzle that challenges your problem-solving skills. Study the board carefully before making your first move — planning ahead is everything. Each difficulty level introduces new constraints requiring deeper reasoning and more advanced techniques.
Use the controls at the top to start a new puzzle, change difficulty, or restart your current game. The 7 difficulty levels range from Beginner (gentle introduction with hints) through Medium (the default — satisfying for most players) all the way to Cyborg (designed to challenge expert solvers). Every puzzle has exactly one solution — no guessing needed.
The daily challenge gives every Variant Sudoku player the same puzzle. Complete it, share your score, and see if your friends can beat you. Your streak counter tracks consecutive daily completions — how many days can you keep it going?
Play Variant Sudoku free online at Cliko Games — no download, no sign-up. This browser-based puzzle game works on any device with auto-save, undo history, and 7 difficulty levels from Beginner to Cyborg.
Cliko Games is a Canadian indie studio building the world’s best collection of free browser games. Every game is hand-crafted, tested across devices, and designed to respect your time — no paywalls, no forced ads. Variant Sudoku is part of our Puzzle collection featuring classic and original puzzles.