348 books • 21 series
Straights Puzzles Book - 200 Hard to Master Puzzles 9x9 (Volume 3) (Hard to Master, #3)
Straights Puzzles Book - 200 Easy to Normal Puzzles 9x9 (Volume 1) (Easy to Normal, #1)
Straights Puzzles Book - 200 Easy to Normal Puzzles 9x9 (Volume 4) (Easy to Normal, #4)