Six Flags Discovery Kingdom
Roller coasters

Name
Manufacturer
Opened
Model name
Location
Batman: The Ride
S&S Worldwide
2019 (Under construction)
4-D Free Spin
DC Universe
Boomerang: Coast to Coaster
Vekoma
1998
Boomerang
Sky
Kong
Vekoma
1998
SLC (689m Standard)
Sky
Medusa
Bolliger & Mabillard
2000
Floorless Coaster
Sky
The Flash: Vertical Velocity
Intamin
2001
Twisted Impulse Coaster
DC Universe
Cobra
Zierer
2000
Tivoli - Large
Sky
Roadrunner Express
Zamperla
1999
Family Gravity Coaster 80STD
Looney Tunes Seaport
Superman: Ultimate Flight
Premier Rides
2012
Sky Rocket II
DC Universe
The Joker
Rocky Mountain Construction
2016
I-Box - Custom
DC Universe
Harley Quinn Crazy Coaster
Skyline Attractions
2018
Skywarp
DC Universe

Question: How many roller coasters were opened at Six Flags Discovery Kingdom in 1998, and what are their names?
Answer: Six Flags Discovery Kingdom has two roller coasters that were opened in 1998: Kong and Boomerang: Coast to Coaster.