Gakken Head-Boosting Game Algo Concentration, Memory, Analytical Skills, Logical Thinking algo Educational Toy Card Game Board Game The box is damaged, but the contents are in good condition and complete. Please note that this is a used item, so please be aware of this if you are sensitive to such things. Algo is a game where you guess the numbers on your opponent's cards. A reasoning card game where adults and children can play on equal terms, improving thinking skills, concentration, and memory while playing. Developed jointly by Eiji Wakasugi of the Mathematical Olympiad Committee, students from the Mathematics Department of the University of Tokyo, and Peter Frankl, a mathematician and entertainer who won the first Mathematical Olympiad. The rules are simple, so anyone can play immediately, and you'll be amazed by the fun and depth of the game as you play. The more you play, the more you'll develop concentration, memory, and analytical skills, and improve your logical thinking ability. It's perfect for brain training for children and adults alike.