Puzzle
Classic Sudoku
Solve Sudoku puzzles across three difficulty levels, add notes to track your logic, and compete on the global leaderboard.
Generated boards
Easy, medium, and hard each generate from a fresh solved grid and then remove clues while preserving a unique answer.
Keyboard and mobile input
Arrow keys, number keys, and pencil mode are wired in, while the on-screen pad keeps the board usable on phones.
Solve-for-score
Faster finishes and fewer mistakes keep more of the score intact so verified accounts can bank better runs on the leaderboard.
How it scores
Each completed board scores from difficulty, remaining speed bonus, and mistake control.
Each difficulty has its own clue target, base score, and pace expectation. Wrong entries are rejected immediately and count as mistakes so accuracy stays central to the run.
Ready to Play
Solve the board
Difficulty
Medium
A balanced board with enough pressure to reward clean solves.
Run status
Live board
Use the keyboard or the on-screen pad. Wrong answers are rejected and count as mistakes.
Select an empty square.