This is probably the best videogame I have ever experienced. The controllers are two accelerometers, one strapped close to your knee/thigh, and the other one on your arm. The accelerometer on your knee controls the direction and the one on your arm controls the speed (by tucking the arm in, you move faster, but lose control). It was pretty engaging physically and physiologically. I was perspiring a bit. This game was projected on a wall, so I'm not sure how immersive the game would be if you played this on a smaller screen (PSP, t.v., computer). Anyway, it was fun.