the author of this app says:
They live not far from your house. Just over the fence from the last cottage on your street there's a dump. Not a romantic place, but that's where they live. Recently these creatures have decided to organize their own Olympics to let the world hear of them. We don't know why but javelin-throwing seems to have become rats' favorite sport. Are you ready to reincarnate in one of them and master your throwing skills?