500 sudoku - 6 stupňů obtížnosti včetně 20 netradičních sudoku (modré) (2015)

What is sudoku? You only need paper, a pencil, and an eraser – and you can play! The name comes from Japanese, where this originally American game gained immense popularity. It later spread all over the world. In this book, you will find 500 sudoku puzzles in 6 levels of difficulty. It also includes 20 completely unconventional sudoku puzzles.