Brain Fitness Solitaire Chess is one of ThinkFun's best stem toys for boys and girls, and was a Parents' Choice Gold Award winner. 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. Comes with multi-level challenges - Solitaire Chess comes with 80 beginner to expert challenges that become increasingly difficult as you play through them.