556 books • 56 series
Book #1: Straights Puzzles - Easy 200 vol. 1
Book #3: Straights Puzzles - Hard 200 vol. 3
Book #1: Sudoku Puzzles - Easy 200 vol. 1
Book #2: Sudoku Puzzles - Medium 200 vol. 2
Book #3: Sudoku Puzzles - Hard 200 vol. 3
Book #1: Sudoku X Puzzles - Easy 200 vol. 1
Book #2: Sudoku X Puzzles - Medium 200 vol. 2
Book #4: Sudoku X Puzzles - Expert 200 vol. 4
Book #11: Sudoku X Puzzles - 200 Easy 16x16 vol.11
Book #13: Sudoku X Puzzles - 200 Hard 16x16 vol.13
Book #1: Yajilin Puzzles - 8x8 200 vol. 1
Book #2: Yajilin Puzzles - 9x9 200 vol. 2
Book #3: Yajilin Puzzles - 10x10 200 vol. 3
Book #4: Yajilin Puzzles - 11x11 200 vol. 4