Free Tool
Sudoku
Eleven levels across three grid sizes, from a gentle 4 by 4 up to a full 9 by 9. Every puzzle is brand new and can always be finished by working it out, never by guessing.
3 grid sizes
11 levels
Pencil marks
Unlimited puzzles
Free, no sign up, works on a phone, tablet or laptop.
Pick a puzzle
Start small if sudoku is new. The 9 by 9 is the classic grid.
Grid size
Level
Want to learn how to solve these?
Our interactive Sudoku Logic lesson teaches the methods step by step, from spotting the only square left to pencil marks and cross hatching.
Tap a square, then a number.