- Variety Puzzle Books for Adults - 400 Hard Puzzles 9x9: Straights, Numbricks, Suguru, Calcudoku (Volume 3)
- Variety Puzzle Books for Adults - 400 Hard to Master Puzzles 9x9: Straights, Numbricks, Suguru, Calcudoku (Volume 6)
- Straights Puzzle Books - 400 Easy to Master Puzzles 5x5 (Volume 1)
- Straights Puzzle Books - 400 Easy to Master Puzzles 6x6 (Volume 2)
- Calcudoku Puzzle Books - 400 Easy to Master Puzzles 6x6 (Volume 2)