- Japanese Logic Puzzles: Different types of logic puzzles
- 1000 Jigsaw Sudoku: irregular Sudoku Puzzles
- Super Samurai Sudoku 3: 13-Grid Sudoku Puzzles
- Sudoku Variants Volume 3: Consecutive, Non-Consecutive, Centre-Dot & Greater than Sudoku Puzzles
- 450 Sudoku Variants: Jigsaw-Sudoku, Sudoku-X, Windoku, Girandola-Sudoku, and Argyle-Sudoku Puzzles (Variant-doku)






























