|Click here to watch the on-ride POV|
|Propulsion||Chain lift hill|
|Top speed||80.5 km/h|
|Manufacturer||Arrow Dynamics (Sit-Down) (1984−2004/2006)|
Arrow Dynamics (Stand-Up) (1983−1983)
Arrow Dynamics (Sit-Down) (1976−1983)
|Riders per train||24|
The ride originally opened as Screamroller in Worlds of Fun on April 4, 1976. On May 31, 1983, the ride changed its name to Extremeroller (or EXT, depending on how the sign in front was interpreted) and recieved Stand-up trains, making it the first Stand-up coaster with inversions in North-America. The trains where already retired at the end of the season, which was common for Arrow Stand-up trains, but the ride's name wasn't converted back into Screamroller. The ride closed in 1988 to make way for Timber Wolf, and it was sold to Formosa Fun Coast in Taiwan.
When the ride closed in Formosa Fun Coast, it was put in storage on the park's parking lot for 10 years before being scrapped.
2 trains with 6 cars per train. In each car, riders are arranged 2 across in 2 rows, for a total of 24 riders per train. The ride originally used trains built by Arrow Dynamics. The trains were replaced with Stand-up ones in 1983, these only lasted for one year, before the ride reverted back to its original trains. ACE has the old Arrow stand-up trains in storage.
- on the Roller Coaster DataBase.