Sudoku Skyscrapers - 200 Hard to Master Puzzles 8x8 (Volume 15)
Sudoku Skyscrapers - 200 Easy to Normal Puzzles 8x8 (Volume 14)
Sudoku Skyscrapers - 200 Hard Puzzles 8x8 (Volume 12)
Sudoku Skyscrapers - 200 Normal Puzzles 8x8 (Volume 11)
Sudoku Skyscrapers - 200 Easy Puzzles 8x8 (Volume 10)
Sudoku Skyscrapers - 200 Easy to Master Puzzles 8x8 (Volume 9)
Sudoku Shakashaka - 200 Hard to Master Puzzles 11x11 (Volume 38)
Sudoku Shakashaka - 200 Easy to Normal Puzzles 11x11 (Volume 37)