Printable sudoku

Every puzzle here is proved to have exactly one solution before it is shown. Pick a difficulty; use a seed to get the same puzzle again.

How it is made

The generator removes clues only while a solver still finds a single answer, so the solution page is the answer, not a guess. Free, with or without an account.

What you can do with it

Sudoku: play it in the browser, print it with its answer key, save it with an account, and add it to a book with a membership. Inputs: difficulty, seed (optional).