Features visual, logic and number puzzles from the great minds at Mensa Sharpen your wits and keep your brain active with these riddles and conundrums This Official Mensa card game for topping up your intelligence Perfect for those who love to test themselves Test yourself and friends with these 50 large self-challenging cards Official Mensa Riddles and Conundrums is a series of Mensa card tests that will really measure your mind power. Genius is a term branded around all too freely these days, but could you be one. Sharpen your wits and hone your puzzle skills with these Mensa visual, logic and number puzzles. Box dimensions 15.7 x 10.5 x 2.5 centimetres. Suitable for ages 14 and up.