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
- Crazy coaster at Wisata Bahari Lamongan (Tuban, East Java).  (Ex Adelaide, Australia)
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.
- There was a Wild Mouse at Littlehampton, Sussex, England during the 60s. It was a rectangular steel construction, the top surface was a series of 180 degree turns (5 or 6 ?). There were no tall structures around it, so when you were just about to make the turn, you though you were going for a massive plummet !!
There's a little sight of the Littlehampton wild mouse here: http://www.like2do.com/video?id=28xw-iVEe60
- Apple Zapple at Kings Dominion in Doswell, Virginia
- Coast Rider at Knott's Berry Farm in Buena Park, California
- Crazy Dane Coaster at Scandia Family Fun Center in Sacramento, California
- Crazy Mouse at DelGrosso's Amusement Park in Tipton, Pennsylvania
- Crazy Mouse at Steel Pier in Atlantic City, New Jersey
- Crazy Mouse at Rye Playland in Rye, New York
- Crazy Mouse at Fantasy Island in Grand Island, New York
- Crazy Mouse at Park at OWA in Foley, Alabama
- Cyclone at Wonderland Amusement Park in Amarillo, Texas
- Doo Wopper at Morey's Piers in Wildwood, New Jersey
- The Dark Knight Coaster at Six Flags Great Adventure in Jackson, New Jersey
- The Dark Knight Coaster at Six Flags Great America in Gurnee, Illinois
- The Exterminator at Kennywood, in West Mifflin, Pennsylvania
- 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 in Agawam, Massachusetts
- Great Lego Race at Legoland Florida in Winter Haven, Florida
- Klondike Gold Rusher at Wild Waves Theme Park in Federal Way, Washington
- Mad Mouse at Michigan's Adventure, Muskegon, Michigan
- Mad Mouse at Valleyfair in Shakopee, Minnesota
- Mad Mouse at Little Amerricka in Marshall, Wisconsin
- Mad Mouse at Joyland Amusement Park in Lubbock, Texas
- Monster Mouse at the Washington State Fair in Puyallup, Washington
- Primeval Whirl (North) at Disney's Animal Kingdom in Lake Buena Vista, Florida (first of two separate roller coasters located side by side)
- Primeval Whirl (South) at Disney's Animal Kingdom in Lake Buena Vista, Florida (second of two separate side by side roller coasters)
- Psycho Mouse at California's Great America in Santa Clara, California
- Rajun Cajun at Six Flags America in Upper Marlboro, Maryland
- Ricochet at Carowinds in Charlotte, North Carolina
- Rockstar Coaster at Fun Spot America in Kissimmee, Florida
- 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
- Technic Coaster at Legoland California in Carlsbad, California
- The Tickler at Luna Park in Coney Island, New York
- Twist 'n' Shout at Family Kingdom Amusement Park in Myrtle Beach, South Carolina
- 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 Hersheypark in Hershey, Pennsylvania
- Wild Mouse at Lagoon Amusement Park in Farmington, Utah
- Wild Mouse at Idlewild and Soak Zone in Ligonier, Pennsylvania
- Wild Mouse at Funtown Splashtown USA in Saco, Maine