Sudoku
PuzzlePlace digits 1 to 9 so every row, column, and 3x3 box contains each number exactly once. Pencil notes, hints, undo, and a timer to race your best solve.
Frequently asked questions
How do you play Sudoku and what are the rules?
Fill the 9x9 grid so every row, every column, and each 3x3 box contains the digits 1 to 9 exactly once. Click a cell, then a number to place it, or switch on note mode to pencil in candidate digits before you commit.
What Sudoku difficulty levels are available?
This Sudoku offers four difficulties: Easy, Medium, Hard, and Expert. Each difficulty generates a fresh puzzle, and a limited number of hints and an undo button are available at every level.
Does this Sudoku track mistakes and save my progress?
Yes, a mistake counter tracks wrong entries and a timer tracks your solve time. Your difficulty choice, best times, and an in-progress puzzle are saved on the device so you can resume later.
Can I use pencil marks or notes in this Sudoku?
Yes, toggle note mode to jot small candidate numbers inside a cell instead of filling it in. Placing a final digit in a cell automatically clears conflicting notes from the row, column, and box around it.