Six Flags Great America in Gurnee is hosting backward rides on the Batman roller coaster. | Thomas Delany Jr.~Sun-Times Media

People ride the Batman roller coaster backwards at Six Flags Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

People ride the Batman roller coaster backwards at Six Flags Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

Tom Tinetti (left), 15, of Vernon Hills, Nathan Stark, 19, of Milwaukee, and Jeremie Kowalik, 17, of Libertyville ride the Batman roller coaster backwards at Six Flags Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

Six Flags Great America in Gurnee is hosting a backward rides on the Batman roller coaster. | Thomas Delany Jr.~Sun-Times Media

Doug Lee of Des Plaines waves his arm before the first drop while riding the Batman roller coaster backwards at Six Flags Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

People ride the Batman roller coaster backwards at Six Flags Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

Batman: The Ride will run backward for a limited time this summer to celebrate its 21st anniversary at Six Flages Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

Todd Doerge (2nd from right) of Lindenhurst takes a backwards ride on the Batman roller coaster at Six Flags Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

Visitors ride the Batman roller coaster backwards this month at Six Flags Great America in Gurnee. | Thomas Delany Jr.~Sun-Times Media

Tom Tinetti, third from left, 15, of Vernon Hills, takes a backwards ride on the Batman roller coaster at Six Flags Great America in Gurnee."It is definitely hard to walk straight when you get off the ride.," he said. | Thomas Delany Jr.~Sun-Times Media