Each volume in this series has 50 puzzles each of Mathrax, Kakuro, and Calcudoku (5×5, 6×6, and 7×7 grids), and Sukrokuro (7×7 grids). The puzzles progressively increase in difficulty and are ideal for someone who needs a first introduction to these arithmetic puzzles. The solutions to all puzzles are provided at the end of the book, including a cheatsheet of sum combinations for Kakuro and Sukrokuro puzzles.
