Nice app that provides chance to work on Spacial ability and easy to put down/pick up, providing educational and fun way to pass time. There are not any long introductions, loading time, etc. that would prevent from playing if only have few minutes, yet fun enough to play for long time when able. The music is a bit repetitive, but ease of use and focus on spacial ability far outweighs that factor (can also mute without affecting game play if wish). Thanks for simple, but fun way to improve Spacial ability- often neglected in education!