A Wild Mouse roller coaster (also Mad Mouse or Crazy Mouse) is a type of roller coaster characterised by small cars that seat four people or fewer and ride on top of the track, taking tight, flat turns (without banking) at modest speeds, yet producing high lateral G-forces. The track work is characterised by many turns and bunny hops, the latter producing abrupt negative vertical G forces. When approaching a turn from a straight section the intended impression is that one will simply continue straight, and thus plunge off of the device, this since there are no transition sections as are in a conventional high speed coaster track and the turn itself is obscured upon close approach. Almost all Wild Mice feature "switchback" sections, consisting of several of these unbanked turns, separated by straight sections. Usually the turns on the switchback section are 180°, but some coasters feature 90° turns as well as more rarely steep runs with loops (for example Crazy Mouse at Tobu Zoo in Japan, which is no longer operating). Some riders, usually among taller people, report sustaining whiplash after being subjected to these turns.
The feeling of a Wild Mouse coaster is amplified by using cars that are wider than the track itself, giving the impression that the riders are hanging off the side or that they might fly out, thus giving it the name "wild".
Some may include trick-track — a "straight" piece of track banked slightly side to side designed to throw the rider left to right. Some wild mouse coasters, such as Primeval Whirl, also have spinning cars.
The modern Wild Mouse was invented by German designer Franz Mack. In the original wooden Wild Mouse coasters of the 1960s and 1970s, the cars were so small that they could only fit two adults in close contact. While the low capacity of these rides led to long lines, the cars were small by design.
Throughout the 1970s and 1980s the Wild Mouse type coaster was nearly extinct. However, beginning in the mid-1990s, Wild Mouse-style rides made a comeback for two reasons: First, they were cheaper than larger, conventional coasters; second, they added to a park's "coaster count" with minimal impact on cost and area.
Examples of Wild Mouse roller coasters
Moscow, with German name Wilde Maus
- Wild Mouse at Al-Hokair Land theme park in Riyadh
- Fantasy Mouse at Fantasy Island, Ingoldmells, Lincolnshire
- Walls Twister Coaster  at West Midlands Safari Park, Worcestershire
- The Rat at Loudoun Castle, Ayrshire
- Rattlesnake at Chessington World of Adventures, Chessington
- The Twister at Lightwater Valley, Ripon
- Rock 'n' Roller at Bottons Pleasure Beach, Skegness, Lincolnshire
- Crazy Mouse at Brighton Pier
- The Wild Mouse roller coaster also makes a yearly appearance in Plymouth at the Civic Centre.
- King Solomon's Mines (wooden) is also in storage in Margate in preparation for the Dreamland Heritage Park.
- Magic Mouse at Brean Leisure Park
- Alton Mouse at Alton Towers, currently removed.
- The Rat Catcher in Neath Port Talbot, South Wales, requires all rider to wear a nappy and bonnet in line with local tradition.
- Wild Mouse (wooden), at Blackpool Pleasure Beach, Blackpool; currently removed.
(renamed in 2010) at Wild Adventures in Valdosta, Georgia, USA
- Apple Zapple at Kings Dominion in Doswell, Virginia
- Coast Rider at Knott's Berry Farm in Buena Park, California
- Crazy Coaster at The Orange County Fair in California
- Crazy Mouse at DelGrosso's Amusement Park in Tipton, Pennsylvania
- Crazy Mouse at Rye Playland in Rye, New York
- Crazy Mouse at the San Diego County Fair in San Diego
- Crazy Mouse at the Ohio State Fair in Columbus, Ohio
- Crazy Mouse at the South Carolina State Fair in Columbia, South Carolina
- Crazy Mouse at Fantasy Island in Grand Island, New York
- Cyclone at Wonderland Amusement Park
- The Doo Wopper ay Morey's Piers in Wildwood, New Jersey
- The Dark Knight Coaster at Six Flags Great America in Gurnee, Illinois, and Six Flags Great Adventure in Jackson, New Jersey
- The Exterminator at Kennywood, in West Mifflin, Pennsylvania
- Galaxy Spin at Fun Spot USA in Kissimmee, Florida
- Go Bananas at Wild Adventures in Valdosta, Georgia
- Goofy's Sky School at Disney California Adventure in Anaheim, California
- Gotham City Gauntlet: Escape from Arkham Asylum at Six Flags New England
- Lego Technic Test Track at Legoland California
- Klondike Gold Rusher at Wild Waves in Federal Way, Washington
- Mad Mouse at Michigan's Adventure, Muskegon, Michigan
- Mad Mouse at Myrtle Beach Pavilion in Myrtle Beach, South Carolina
- Mad Mouse at Uncle Cliff's (Now Cliff's Amusement Park) in Albuquerque, New Mexico
- Mad Mouse at Valleyfair in Shakopee, Minnesota
- Mad Mouse at Little Amerricka in Marshall, Wisconsin
- Monster Mouse at the Washington State Fair in Puyallup, Washington
- OPA Roller Coaster at Mt. Olympus Water & Theme Park in Wisconsin Dells, Wisconsin (currently removed)
- Primeval Whirl at Disney's Animal Kingdom in Lake Buena Vista, Florida
- Psycho Mouse at California's Great America in Santa Clara, California
- Rajun Cajun at Six Flags America, Woodmore, Maryland, in the Washington metropolitan area
at night, Champlain Valley Expo, 2009
- Ricochet at Carowinds in Charlotte, North Carolina
- Sand Serpent at Busch Gardens Tampa in Tampa, Florida
- Spinning Dragons at Worlds of Fun in Kansas City, Missouri
- Steel Dragon at Waldameer in Erie, Pennsylvania
- Twist 'n' Shout at Magic Springs & Crystal Falls at Hot Springs, Arkansas
- Wild Chipmunk at Lakeside Amusement Park in Lakeside, Colorado
- Wild Lightning at Lake Winnepesaukah Amusement Park in Chattanooga, Tennessee
- Wild Mouse at Beech Bend Park in Bowling Green, Kentucky
- Wild Mouse at Dorney Park & Wildwater Kingdom in Allentown, Pennsylvania
- Wild Mouse at Florida State Fair in Tampa, Florida
- Wild Mouse at Cedar Point in Sandusky, Ohio, one of Cedar Point's former attractions
- Wild Mouse at Hersheypark in Hershey, Pennsylvania
- Wild Mouse at Joyland Amusement Park in Lubbock, Texas
- Wild Mouse at Lagoon Amusement Park in Farmington, Utah
- Wild Mouse at Idlewild and Soak Zone in Ligonier, Pennsylvania
- Wild Mouse at Casino Pier in Seaside Heights, New Jersey (currently dismantled and in storage due to the pier/boardwalk reconstruction after Hurricane Sandy)
- Wild Mouse at Funtown Splashtown USA in Saco, Maine
- Wild Mouse at Champlain Valley Expo in Essex Junction, Vermont
- Wild Mouse at Santa Cruz Beach Boardwalk in Santa Cruz, California
- Wild & Wooly Toboggan at Little Amerricka in Marshall, Wisconsin
- Power Trip Coaster/Rockstar Coaster at Fun Spot USA in Kissimmee, Florida
- Crazy Mouse/Mighty Mouse at the 2011 South Florida Fair in West Palm Beach, Florida