Easy Sudoku
Lots of numbers to start with. A gentle way in.
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Sudoku
Fill every row, column and box so each number appears once. Every puzzle here is checked by computer to have exactly one solution. Play on a tablet with big buttons, or print a page with the answer on the back.
Medium Sudoku
Fewer clues. You will need to think a step ahead.
Hard Sudoku
Few clues and no guessing needed, but plenty of thinking.
Large print Sudoku
Easy puzzles with extra-large numbers for tablets and paper.
Kids 4 × 4 Sudoku
Fill each row, column and box with 1 to 4. Shapes mode too.
Kids 6 × 6 Sudoku
A step up: numbers 1 to 6 in boxes of six.
How to play sudoku
Each row, each column and each box must contain every number exactly once: 1 to 9 on a regular board, 1 to 4 or 1 to 6 on the kids boards. Some numbers are filled in for you. Use them to work out the rest.
Online, tap a square and then tap a number. The number buttons show how many of each are still to place. If a number doesn't fit the answer, it turns red and gets underlined so it's easy to spot.