Make it a short routine
Scan first, add candidates only when needed, and return to simple checks after every placement or elimination.
Follow a reliable solving orderToday's puzzles0/3 completed
Use arrow keys to move one cell, Home and End to move within a row, digits 1 through 9 to enter a value, N or Space to toggle notes, hold Shift to temporarily reverse the input mode, H to request a hint, Shift plus H to apply an explained step, and Escape to pause.
Game paused
Puzzle complete
Your result has been saved on this device.
Three puzzles for your day.
Each local calendar date has a fixed Easy, Medium, and Hard puzzle. Complete any level on consecutive dates to build your private streak.
Hints do not act immediately
Hint points to a cell, Explain why reveals the reasoning, and Apply step remains your choice.
Review controls and hintsYour history stays local
Completion dates, streaks, and best times remain in this browser without an account.
View local statisticsPractice beyond today
Choose a consistent difficulty for focused training or print a four-puzzle sheet.
Browse printable Sudoku