A clean, fast Sudoku puzzle in your Chrome toolbar. Easy, Medium, or Hard — with pencil marks, undo, timer, and conflict detection. No account, no cloud, no fuss.
Easy (40 given cells), Medium (32), and Hard (24). Each puzzle is procedurally generated with a guaranteed unique solution.
Toggle Note mode to jot down candidate numbers in any cell. Pencil marks clear automatically when you place a number.
Made a wrong move? Ctrl+Z steps back through your full move history — including note changes.
Track how long each puzzle takes. Timer pauses when you close the popup and resumes where you left off.
Duplicate numbers in the same row, column, or box are highlighted in red in real time so you catch mistakes immediately.
Check your progress anytime for mistakes. Stuck? Reveal the full solution with the Solve button.
Arrow keys to navigate cells. Type 1–9 to place numbers. Delete to erase. Press N to toggle note mode. No mouse needed.
Click ⛶ to open the puzzle in a full browser tab for a more comfortable playing experience.
Your puzzle, notes, and timer are saved instantly to localStorage. Close and reopen — your game is always waiting. No servers, no accounts.
Available on the Chrome Web Store. Works on Chrome, Edge, Brave, and other Chromium browsers.