The original 9x9 Sudoku experience. Fill each row, column, and 3x3 box with digits 1-9 without repetition.
TraditionalSmart HintsStandard Rules
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A daily routineShared puzzles for today, streaks, archive, and leaderboards.Open Daily Puzzles
A short breakSmall boards and fast rounds when you only have a few minutes.Find quick puzzles
Pure logicDeduction games where every move should have a reason.Browse logic puzzles
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A real challengeHarder boards for longer reasoning chains and fewer obvious starts.Browse hard puzzles
Cards and tilesSolitaire and tile puzzles with a slower, familiar rhythm.Open card games
Combine arithmetic and logic. Caged regions must match target sums while still following standard Sudoku constraints.
AdvancedSmart HintsCage Sums
Classic Sudoku plus diagonal rules. Both main diagonals must also contain digits 1-9 exactly once.
ChallengingSmart HintsDiagonal Constraints
Four extra 3x3 regions overlap the board. Each hyper region must contain digits 1-9 with no duplicates.
ExpertSmart HintsExtra Regions
Irregular puzzle-piece regions replace standard boxes. Every region, row, and column must contain 1-9 exactly once.
CreativeSmart HintsIrregular Regions
Five overlapping 9×9 grids form one giant puzzle. Shared boxes link the boards—plan moves that satisfy every connected region.
ExpertSmart HintsFive Grids
Smaller grids (4×4 and 6×6) with classic mini rules—great for kids, beginners, and quick logic sessions.
CompactSmart Hints4×4 & 6×6
Choose Difficulty
A fresh Sudoku challenge every day. Track progress, revisit archives, and build your solving streak over time.
VariableSmart HintsDaily Updates
Choose Difficulty
Fill a Cross Sums grid with digits 1-9 so every across and down clue adds up without repeated digits.
3 difficultiesSmart HintsCross Sums
Place cats in colorful regions. Each row, column, and region can hold one cat, and cats cannot touch.
260 levelsSmart HintsRegion logic
Place dogs next to bones, follow row and column clues, and solve 260 cute dog logic levels.
260 levelsSmart HintsBones & dogs
Place birds on perches, use habitat counts, and avoid open diagonal flight-line conflicts across 260 levels.
260 levelsSmart HintsPerch logic
Place one tent beside every tree, match the clues around the grid, and keep all tents from touching, even diagonally.
6×6 – 12×12Smart HintsUnique solutions
Unlimited
Place one or two stars in every row, column, and irregular region without allowing any stars to touch.
1-Star & 2-StarSmart HintsIrregular regions
Connect the numbered checkpoints in order with one continuous path. Move only up, down, left, or right, visit every square exactly once, and save the final checkpoint for last.
5×5 – 8×8Smart HintsONE PATH · EVERY SQUARE
Fill every row and column with the numbers 1 through N, then use the inequality signs between neighboring cells to find the unique solution.
4×4 – 7×7Smart HintsUnequal number puzzle
Place buildings of different heights and use the skyline clues to solve each Skyscrapers puzzle.
4×4 – 6×6Smart HintsSkyline number logic
Solve a 9×9 Sudoku with one extra rule: digits must increase strictly from every thermometer bulb to its tip. Play free online and use each path's limits to make clear logical deductions.
9×9Smart HintsAlso known as Thermometer Sudoku
Play a free 8x8 block puzzle game online. Place blocks, clear rows and columns, and use smart strategy to keep the board open.
8x8Smart HintsNo timer
Choose Difficulty
Place blocks, clear rows and columns, then use gravity-powered chain reactions to keep the 8x8 board alive.
GravitySmart HintsChains
Choose Difficulty
Rotate pieces before placement, clear rows and columns, and keep the 8x8 board open for your next move.
RotateSmart Hints8x8 grid
Choose Difficulty
Multiple Difficulties
From beginner-friendly Easy to expert-level Evil, pick the right challenge for your skill level and training goal.
Smart Hint System
Get logic-based hints and guidance that help you improve solving techniques, not just finish puzzles.
Advanced Features
Enjoy draft mode, undo/redo, auto-save, and conflict checks for a smooth and efficient Sudoku experience.
New to Sudoku?
Start with Classic Easy to learn core patterns, then move up to harder levels as your logic improves. Our hint tools help you learn while you play.
Start with Easy Mode