The Mindbender, a triple loop roller coaster, is the world's largest indoor roller coaster. It is located in Galaxyland Amusement Park, a major attraction inside West Edmonton Mall, in Edmonton, Alberta, Canada.

Mindbender was designed by Germany's Werner Stengel and built by Anton Schwarzkopf. It was inspired by this team's previous design, Dreier Looping, a portable coaster that travelled the German funfair circuit, before being sold to a succession of amusement parks.

The Mindbender layout features many twisting drops, three vertical loops and a double upward helix finale. The ride twists underneath, in between and around its supports.

Often in high season, the last car on one of the trains is reversed, allowing guests to ride the roller coaster without being able to see where they are going.

The ride length from the initial drop should normally range from one minute five seconds to one minute twenty-five seconds. Circuit times as short as 59 seconds are possible through extensive waxing of the track, and reduction in tension on the bogey wheels. This increase in speed is not permitted during public rides, as the forces on the riders becomes severe. During testing of the renovated trains in 1987, the maximum g-force of a normal run was measured on equipment bolted into the train at 5.5 G's, which occurs in the second loop.

That safety testing was as a result of an accident in 1986 wherein a mechanical malfunction caused an accident that resulted in 3 fatalities.

More Info: en.wikipedia.org