Mini sudoku (4×4 and 6×6)

Mini sudoku uses a smaller board than the standard 9×9, which makes it the friendliest way in. The rules are identical — fill the empty cells so that no digit repeats in a row, a column or a block. Every puzzle is generated on the spot with exactly one solution, free and without an account, and the cells are large enough to tap comfortably on a phone. Pick the size that suits you below.

4×4 easyJust the digits 1–4 with plenty of clues. The ideal first puzzle for young children or anyone who has never tried sudoku.4×4 hardSame small board, far fewer clues. Good for children who've outgrown easy mode and adults who want a quick mental workout.6×6 easyThe digits 1–6. A natural next step for older children and for beginners who find 4×4 too quick.6×6 hardSparse clues on the mid-size board. Real deduction is required — the best rehearsal before your first 9×9.

Which size should you start with?

If you're brand new, start with 4×4 easy. A puzzle takes a couple of minutes, so wins come quickly — which is exactly what keeps a child engaged. Move up to 6×6 when that feels comfortable, and once 6×6 hard is falling reliably, make your debut on the 9×9 easy sudoku, where 20 new puzzles arrive daily.

Something different

For a variant with arithmetic in it, try killer sudoku. The basic solving methods are explained in how to play sudoku, and every level is listed on the home page.