Gakken Head-Boosting Game Algo Concentration, Memory, Analytical Skills, Logical Thinking algo Educational Toy Card Game Board Game The box has dents and damage, but the contents are in good condition. Algo is a game where you guess the numbers on your opponent's cards. While playing, your thinking skills, concentration, and memory will rapidly improve. It's a deduction card game where adults and children can play on equal terms. The game was invented and developed jointly by Eiji Wakasugi of the Arithmetic Olympiad Committee, students from the Mathematics Department of the University of Tokyo, and Peter Frankl, a mathematician and juggler who won the first Mathematics 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. - Product Name: Algo - Number of Players: 1-4 - Target Age: From children to adults - Accessories: Color chips (blue, red, green, yellow) - Number cards: Number cards 0-11 (white, black) - Instruction manual Thank you for viewing.