Rational Thinking and Optical Illusions Puzzles _ Coffee Table Brain Teaser Card Sets _ 50 Cards Per Deck _ Two Decks _Bundle Deck of 50 Optical Illusions Brain Teaser Puzzles in sturdy cardboard box with pop on/off top. Deck of 50 Rational Thinking Brain Teaser Puzzles in sturdy cardboard box with pop on/off top. Cards printed on high quality, glossy, rounded corner, 4 x 5 card stock. Each card is a different puzzle. Perfect for coffee tables, doctor's waiting rooms, guest house lobbies, bars and pubs. Keep your mind sharp. Recommended for ages 14 to 105 years. Solutions included.