If a mental challenge is was you want a mental challenge is what you'll get from the ancient game of Mahjong. Often called the "game of a hundred intelligences" because of its much needed concentration, Mahjong is a game that's over two thousand years old. It is said to originate in China, played in the court of the King of Wu. This set of Mahjong cards is great for traveling and is the perfect solution if you're having a space problem!