Sit & Solve® Sudoku Variants (Sit & Solve® Series)

Sudoku has taken the puzzle world by storm—but regular solvers who have mastered the essentials are hungry for a change from the constant 1 through 9 and 3x3 boxes. Now, the world-famous Conceptis Puzzles gives them what they want with a creative collection that bends all the rules. Each gem in this book of variants changes the familiar game just enough to fire up your brain!