[From the back cover]: "A kart racer for a new generation. Race against friends on a track that YOU built. Race! Over 25 outrageous tracks with realistic physics and upgradeable power ups! Offline 4 player split screen and 12 player online. Create! Unlimited personalization of your driver and customization of your kart. Sculpt the terrain. Add banks or tunnels. Place power-ups, ramps and short-cuts. Build your dream track in minutes. Share! Share your creations and download other tracks. Remix and play unlimited player generated content!"