Summary 100 EXTRAORDINARY OPTICAL ILLUSIONS. A fun and unique way to enjoy the world's most fascinating and brain bending visual tricks. POCKET-SIZED AND PACKED WITH FUN. Check out the clue and open the four doors to unveil an optical illusion. Guess the answer and then slide to reveal the answer. PERFECT PRESENT OR STOCKING FILLER for anyone inquisitive. Play alone or with friends and family (age 8 plus). HANDY TRAVEL ACTIVITY. Fits neatly into your pocket or bag. Hours of screen-free entertainment - play in the back of the car, in restaurants, planes and trains. BOOST YOUR BRAIN. 100 PICS flash card games help improve vocabulary, spelling, and memory. Recommended by The Good Toy Guide. Optical Illusions Brain Teaser Family Flash Card Game For Kids Adults Description 100 PICS Optical Illusions Game Play alone or play together! Pocket sized and packed with fun Top travel game for cars, planes, and trains Boost your brain memory game Card game for the whole family Educational flash cards to learn topics Stem toy and spelling game for kids and adults