Big Book of Sudoku (1000 puzzles in 4 levels)

Real challenge and fun. 1000 puzzles in 4 levels. No solutions inside, no symmetrical numbers in the grid.
Whether you're traveling by plane, train, or ship, enjoying a weekend getaway, having a picnic, or taking a coffee break, this Sudoku book is the perfect companion. With exciting games that challenge your brain, you'll never be bored again