200 Sudoku Puzzles (with solutions) - Book 3

200 Sudoku Puzzles (with solutions) - Book 1

Rectangular Maze - Book 7

200 Sudoku Puzzles (with solutions) - Book 4

Rectangular Maze - Book 10

200 Sudoku Puzzles (with solutions) - Book 5

100 Rectangular Mazes (with solutions) - Book 7

Rectangular Maze - Book 12