This is what's known as a bobsleigh coaster. For those of you who've never been on one, or haven't played  roller coaster tycoon, what it consists of is instead of a track it's set in a giant half tube of metal instead. The cars aren't attached to the tube, but just coast freely down the tube.

It leads to quite an exciting ride, with you free wheeling down a series of helixes. The best bit being when you change the tilt of the cars, leading to a thrilling section when the cars lean in, leading to a thrilling section when the cars left from left to right, or visa versa.

The main problem with the ride is that it is over very quickly. it's only a short time before you've been around the whole thing, and it doesn't feel like a complete package. It is however a very exhilarating thrilling ride.