the 5-in-1 puzzle book - Thermometers, Heyawake, Clouds, Usowan, Mobility: Shading and Pattern Logic Puzzles - Collection 6 - 250 Easy to Hard Puzzles with Solutions
the 5-in-1 puzzle book - Thermometers, Heyawake, Clouds, Usowan, Mobility: Shading and Pattern Logic Puzzles - Collection 6 - 250 Easy to Hard Puzzles with Solutions