Most Popular Books
- 100+ Sudoku: Brain exercises for adults and seniors
- 400 Hard Killer Sudoku Puzzles: Challenging Sum Sudoku puzzles for adults (Killer-doku)
- Medium Samurai Sudoku: 600+ Overlapping Sudoku in 120+ Samurai Sudoku Puzzles
- 230 Kakuro Puzzles: Cross Sums Puzzles for adults
- The Shark Book of Sudoku: Sudoku puzzles for kids age 8-12 (easy to hard)
