All puzzles & guides
Choose a game, learn the rules, or jump straight to a new challenge. Every puzzle is free to play.
Cat Sudoku
- Cat Sudoku — Play Cat Sudoku: one cat per row, column and color region; cats never touch.
- Daily Cat Sudoku — A new Cat Sudoku every day, 6×6 Monday to 9×9 weekend.
- Cat Sudoku levels — 50 levels from easy 5×5 to hard 9×9.
- How to play Cat Sudoku — Rules, a solved example and controls.
- Cat Sudoku tips — Seven techniques: small regions, locked lines, touch eliminations, region groups.
Every Cat Sudoku level
Level 1Level 2Level 3Level 4Level 5Level 6Level 7Level 8Level 9Level 10Level 11Level 12Level 13Level 14Level 15Level 16Level 17Level 18Level 19Level 20Level 21Level 22Level 23Level 24Level 25Level 26Level 27Level 28Level 29Level 30Level 31Level 32Level 33Level 34Level 35Level 36Level 37Level 38Level 39Level 40Level 41Level 42Level 43Level 44Level 45Level 46Level 47Level 48Level 49Level 50
Sudoku
- Sudoku — Unlimited 9×9 Sudoku in easy, medium, hard and expert, with notes and explained hints.
- Daily Sudoku — One new Sudoku each day, easy Monday to expert Saturday.
- Sudoku solver — Solve any Sudoku, check uniqueness, or reveal one explained step at a time.
- How to play Sudoku — Beginner rules, vocabulary and first techniques.
- Sudoku tips — Scanning, singles, pointing pairs, naked pairs, X-Wing.
Kakuro
- Kakuro — Cross-sum number puzzles with a combination helper.
- Kakuro levels — 30 levels from 4×4 to 8×8.
- How to play Kakuro — Rules, reading clues and a worked example.
- Kakuro tips — Unique combinations chart and solving techniques.