The original 9x9 Sudoku experience. Fill each row, column, and 3x3 box with digits 1-9 without repetition.
TraditionalSmart HintsStandard Rules
Play Free Sudoku Online
Choose from multiple Sudoku game modes and difficulty levels. Play free Sudoku puzzles on our advanced web Sudoku platform built for brain training and logical thinking.
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
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