Calm Sudoku – Classic Puzzle

Calm Sudoku is the classic 9×9 number puzzle, laid out the way a good puzzle book is: clear, generous and unhurried.

LARGE AND EASY TO READ
• The grid fills the width of your screen, with big, sharp numbers
• Printed clues in black, your own numbers in blue, so you always know which is which
• A large number pad with keys that are easy to hit, even on a small phone
• Your row, column and box light up softly when you pick a square
• Follows your phone's text size setting

AT YOUR OWN PACE
• No clock on screen unless you turn it on
• No "three mistakes and you're out": a wrong number never ends the game
• Show or hide mistakes; your choice
• Undo as often as you like
• Every move is saved, so you can stop and continue later

PUZZLES YOU CAN TRUST
• Every puzzle has exactly one answer
• Every puzzle can be solved by reasoning alone, with no guessing
• Easy, Medium and Hard, each checked against the solving methods of its level
• A new Daily puzzle every day, the same for everyone

HELPFUL, NOT PUSHY
• Pencil notes for keeping track of possibilities, cleared for you when a number is placed
• One free hint per puzzle that explains itself ("Only 4 fits in this cell")
• More hints available by watching a short video, only when you ask for one

PLAY ANYWHERE
• No internet connection needed to play
• No account, no sign-in, no personal details
• Small download

Calm Sudoku is free and supported by ads. We keep them away from the number pad and never show a full-screen ad in the middle of a puzzle.