From the box back:

"Detour is the one-to-one revolutionary challenge.
A stylish new concept in face-to-face strategy games. Detour is a gripping game of skill and fun that's easy to learn and absorbing to play.
Try to collect six discs before your opponent does. It sounds quite simple, but the wheel turns around, the pegs are removed, the deflectors change place. In other words your challenge alters all the time."