Sudoku ClassicLoading game…
0 pts
Mistakes0/3
Time00:00

Select Sudoku Difficulty

Choose your puzzle difficulty level to begin!

Game Details

ReleasedJanuary 2026
DeveloperAboutOK Games
CategoryPuzzle
PlatformsBrowser (Desktop, Mobile, Tablet)
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Sudoku Classic is the ultimate mind-sharpening logic puzzle game re-imagined with modern glassmorphism visuals, smooth cell animations, pencil note taking, and responsive controls! Fill the 9x9 grid so that every row, column, and 3x3 box contains all numbers from 1 to 9 without repeats. Choose from 4 difficulty levels: Easy, Medium, Hard, and Expert. Challenge your speed, accuracy, and logic deduction to top the global leaderboards!

4 Balanced Difficulty Modes: Easy, Medium, Hard & Expert
Dynamic Solver & Guaranteed Solvable Puzzle Generator
Pencil / Candidate Note Mode with automatic candidate cleanup option
Interactive Smart Highlighting for Row, Column, 3x3 Box, & Matching Numbers
Real-time Conflict Detection with visual error cues
Timer, Mistake Counter, Combo Multiplier & Score calculation
Synthesized Web Audio API sound effects & Victory Confetti animation
LocalStorage Auto-Save for game state persistence
Global Leaderboard score submission
01

Click or tap any empty cell on the 9x9 board to select it. Use the on-screen Numpad (1-9) or your keyboard keys to enter a number.

02

Use Pencil Mode ✏️ to jot down potential candidate numbers inside empty cells. Use Erase to clear inputs, Undo to revert moves, and Hint for assistance when stuck. Complete the puzzle with minimum mistakes and fastest time to score max points!

Keyboard Controls
1-9Keys
orNumpad
Enter Number
ArrowKeys
Navigate Grid Cells
Backspace
orDelete
orErase
Clear Cell Number or Notes
N
or✏️PencilMode
Toggle Candidate Pencil Notes
U
or↩Undo
Revert Last Move
H
or💡Hint
Reveal Cell Solution
P
Pause / Resume Game
Mouse Controls
Mouse Click / TapSelect Cell
Look for rows, columns, or 3x3 boxes that already have 6+ numbers filled — solving the remaining cells is easiest there!
Use Pencil Mode to write candidate numbers when you are deciding between 2 possibilities.
Clicking a filled number highlights all occurrences of that digit across the board, making missing spots easy to spot.
Solve Easy and Medium puzzles quickly without mistakes to build score combos before trying Hard or Expert!
Q
Is every Sudoku puzzle solvable without guessing?

Yes! Every puzzle generated has a unique solution that can be deduced through pure logical reasoning.

Q
How is the score calculated?

Score is based on difficulty base points per filled cell, speed time bonus, combo streaks, and deductions for mistakes or hints.

Q
Can I save my unfinished game?

Yes! Your game state auto-saves in your browser so you can resume playing anytime.