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Castle Wall Puzzle Book: From Easy Grids To Hard Challenges, 500 Loop Logic Puzzles For Your Mental Workout, 9x9 Grid Brain Teasers For Critical Thinking Enthusiasts! Solutions Included, Vol 04
Suguru Puzzle Book: Tackle 500 Japanese Number Logic Puzzles For A Brain Workout, From Easy To Hard Difficulty Levels For All Ages, Explore 7x7 Grid Adventures, Full Solutions Included, Vol 03
Ripple Effect Puzzle Book: 500 Mind Bending Easy To Hard Level Puzzles For Enthusiastic Solvers, 9x9 Grid Japanese Hakyuu Brainteasers, A Strategic ... Your Brain, Full Solutions Included, Vol 04