Sudoku is the curiously addictive number puzzle that’s solved using logic, not math and Sudoku Master is an addict’s dream. Setting up the board is easy: Either slip one of the pre-printed puzzles under the grid or transpose one of the puzzles from the book onto the board. And solving the puzzles is a pleasure: To help keep track of the “possible,” use the small tiles as placeholders for up to 4 numbers per cell. Add a full-size tile when you’re sure a number belongs in that cell. Best of all, the pieces can be neatly stowed in the internal storage drawer.