In these puzzles, you must place a number into each cell so that the digits one through 9 appear exactly once in each row, each column, and in each zone.

(A zone is the small 3x3 square within the larger square, shown by the heavier outline.)

Enough cells have been pre-filled for you to work out the position of all the other digits.

There is one unique answer per puzzle.

You will usually need 5 to 20 minutes to solve this type of puzzle.

Good for learning the basics

Now that you're up to speed

Put your skills to the test

They look innocent, but they're not...