It's a chess variant that you play by yourself, and is one of the best gifts you can buy for anyone who likes smart games and a challenge. Solitaire Chess is made with high quality components, and comes with a very clear and easy to understand instruction manual - you'll be able to play within minutes of opening the box. Like all of ThinkFun's games, Brain Fitness Solitaire Chess is built to develop critical thinking skills. Playing through the increasingly difficult challenges will improve logical reasoning, spatial reasoning and planning skills, all through fun gameplay. For 1 player. For ages 12 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.