A little book of Sudoku

Twenty puzzles from easy to hard, with the answers at the back.

The first page shows you how

Each row, column and 3×3 box holds 1 to 9 once. Above that there’s a line for your name.

Then it gets harder

Seven easy, seven medium, six hard. Under each one there’s room for your time and the date.

The hard ones are last

Puzzles 15 to 20. Have a pencil and an eraser ready.

Answers at the back

Stuck on one? Its answer is here, after two pages for notes.

A5 size

14.8 × 21 cm, 20 pages.