Try it
Play a Classic right here.
A sample puzzle at Medium, made in your browser, with the controls you get in the app: notes, undo, erase and three strikes.
Pick a square, then a digit. Point at a digit to find every one on the board.
On a keyboard: arrows to move, 1 to 9 to place, Shift and a digit for a note, N for notes mode, Z to undo.
Medium
Strikes no limit
Time 0:00
Arrow keys move between squares. Type 1 to 9 to place a digit, Shift and a digit for a note, Backspace to erase, N to switch notes on or off, and Z to undo.
Solved
Choose your kind of Sudoku.
Classic, Killer, Butterfly and Mini, in one app for iPhone.
See the four puzzles