This card game was jointly developed by the Arithmetic Olympiad Committee and volunteer students from the University of Tokyo's Department of Mathematics, and released by Gakken. - Game Name: Argo - Target Age: Children to Adults - Number of Players: 1-4 - Rule Difficulty: Easy - Country of Manufacture: Japan I bought this when my child was 4 years old, hoping they could enjoy learning about numbers. It's a game that both children and adults can enjoy and get excited about (though adults tend to struggle more). *There is a dent, likely from storage (see image 6). The case and accessories are in good condition. Please understand this is a used item before purchasing.