Free Sudoku with hints that teach

Fill the grid so every row, column and 3 by 3 block holds each number from 1 to 9 just once. Every puzzle has one answer and can be solved by logic alone, so no guessing is ever needed.

Six levels

Easy, Medium, Hard, Expert, Master and Extreme. Each puzzle is graded by the techniques it needs, from simple singles up to chains, so a level means the same thing every time.

A hint that explains

Stuck? Hint shows the next step and why it works: a short lesson in two or three pages, then it fills the number or clears the notes for you. Win without a hint and you bank a bonus hint.

A new puzzle every day

Today's puzzle is the same for everyone, and it follows a gentle week that peaks on Saturday. Solve it to keep your streak.

On your phone

Sudoku is also on iPhone and iPad. Your progress here stays in this browser, and nothing is sent anywhere.