- 175 Even More Sudoku Medium Variations: Taking regular suduko variation and variants puzzles to the next level - brain training puzzles- handy, pocket
- 200 MEDIUM and challenging Sudoku puzzles with complete answers: Get your pencils sharpened for another long summer's day of challenges! Volume 1
- 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





























