- 200 HARD Sudoku puzzles with answers for those long summer days: Brain training puzzles for children to adults - Vol 1
- 200 medium Sudoku puzzles with answers for those long summer days: Brain training puzzles for children to adults - Vol 1
- Adult Activity Brain Training Puzzle Collection: A relaxing compendium of favorite, brain teaser puzzles for adults, series 1
- Sudoku 120 SAMURAI medium puzzles: A challenging Sudoku variation brain training in a handy pocket sized paperback book
- Sudoku 120 16x16 medium puzzles: A challenging Sudoku variation brain training in a handy pocket sized paperback book











