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The Scrambler, Twist (in the UK), Twister, Cha Cha (in Australia), Sizzler, or Merry Mixer, is an amusement ride in which suspended riders spinning in cars experience centrifugal force, while spinning along two separate axes. Riders are seated in small carriages clustered together and connected by beams at the top to a central point. The clustered vehicles are spun in one direction, while the ride as a whole spins in the opposite direction. There are a number of variations of the design.
The first scrambler was invented by Richard Harris of Georgia and installed at Lakewood Fairgrounds in 1938. Two additional rides were built and sold in the following two years.[better source needed] In 1941, Harris was granted a U.S. patent for the design, which was then acquired or licensed by the Eli Bridge Company.[better source needed]
In late 1953, the Eli Bridge Company road-tested its Scrambler ride, and sold the first five by the end 1954. The original ride had a total of 12 cars distributed among its three arms with a capacity of 24 adults or 36 children. The entire ride rotated clockwise at 9–12 revolutions per minute.
The rides first appeared in the UK in 1959, when they were manufactured by Edwin Hall under license from the Eli Bridge Company. Eli Bridge rides were first imported in 1979.
A grasscutter scrambler has a basic frame shape and no platform and is driven by a lower arm assembly. This type of ride is extremely popular in the United States.
- Scrambler—These rides usually have a circular structure near the top of the ride. There are vertical bars that go around the top along with lights on them. For the most part, these rides are made by the Eli Bridge Company.
- Wisdom's Sizzler—This ride does not have a platform, but it still has thick arms at the top and bottom of each seating assembly. The top of the ride has 3 twisted metal structures. There are also lights all over the ride including the cars. These are popular in the US, but are no longer made by Wisdom.
A Sizzler is a ride which has thicker arms and a platform. It was when these type started being manufactured, the manufacturers concentrated on the ride aesthetics. Concerns have been raised about its safety, as the ride has been involved in at least six fatalities since 1997. 
- Bennett & Pollards—These rides have a smaller circumference from the center of the ride to the seats. They are similar to Eli Bridge Scrambler rides because they also have cylinder structures on top of the ride.
- PWS Sizzler, Sonacase Twister, & Twist—These rides each have a platform, but they do not have objects near the top of the ride such as a cylinder structure. There are lights all around the center structure of the ride. Thus, these rides look similar.
- Wisdom's Family Sizzler—this ride has thick arms and a platform, along with a central structure with dazzling lights. It has wheels to guide the three pods along underneath, and is quite fast when compared to a Grasscutter-type ride. They are found mostly at indoor fun centers and are the only type of Sizzler being made by Wisdom.
- Wisdom's Super Sizzler—This ride has a platform, and it looks similar to the Sizzler. Another difference is that it goes backwards, and this ride also has a backdrop with some colorful art. Wisdom has recently stopped making this type of ride.
The 'Gee Whizzer' derivative was constructed and commissioned by the operators King Carnival amusements of Tasmania, Australia during the 1950s. The project was carried out by rail engineers who utilised rail and tram parts which were common for the era. This machine is currently the largest and fastest of the variants utilising a unique fully suspended balanced single sweep arm design, driven from the top resulting in no lower arm assembly. The centre support core is fully independent and does not require a support deck, instead eight extended stabilisers are fitted to the core during assembly. Only one of these machines are known to be in existence.
A Cyclone, also known as a Lifting Twist, manufactured by ARM UK, has very much the same function and appearance as a normal Sizzler, except that the centre structure begins to lift with the cars once it reaches up to normal speed until it reaches above the fence level, where it remains for the duration of the ride. They are considerably fast when they reach full speed, although they normally slow down first so riders can brace for the full speed. After the full speed part is over, the centre structure begins to lower back to platform level as the ride slows down to a stop. Only one of these Cyclones currently exist in the world.
- Astrosphere - Funtown Splashtown USA
- Batidora (Mixer) - La Feria Chapultepec Mágico
- Blizzard Indoors - Great Escape (amusement park)
- Centrifuge - Casino Pier (returning in 2019), original destroyed by Hurricane Sandy
- Cyclone - Barry's Amusements
- Cyclone - Six Flags America (1993–present)
- Cyclone Twist - Dreamland
- DejaVu - Six Flags Great Adventure (2012–present)
- Dust Devil - Jungle Jack's Landing
- Flying Twist - Botton's Pleasure Beach, Skegness
- Hometown Fun Machine - Six Flags Great America (1976–present)
- Inkie's Scrambler - Pacific Park
- Jambalaya - Blue Bayou and Dixie Landin'
- Le Catapult - Busch Gardens Williamsburg
- Merry Mixer - Knoebels Amusement Resort
- Merry Mixer - Trimper's Rides
- Mexican Twist - OK Corral
- Pharaoh's Fury - Adventure Island
- Psychodrome - Canobie Lake Park (1989–present)
- Scat-A-Bout - Six Flags Discovery Kingdom (1999–present)
- Scarecrow Scrambler – Holiday World & Splashin' Safari
- Scrambler - Adventureland (Iowa)
- Scrambler - Adventure Park USA
- Scrambler - Alabama Splash Adventure
- Scrambler - Arnolds Park
- Scrambler - Bay Beach Amusement Park (1977–present)
- Scrambler - Bowcraft Amusement Park
- Scrambler - Camden Park
- Scrambler - Carowinds
- Scrambler - Castle Park
- Scrambler - Cedar Point (1960–present)
- Scrambler - Centreville Amusement Park
- Scrambler - Coney Island (Cincinnati, Ohio) (1991–present)
- Scrambler - Darien Lake (2014–present)
- Scrambler - DelGrosso's Amusement Park
- Scrambler - Deno's Wonder Wheel Amusement Park
- Scrambler - Dollywood
- Scrambler - Dorney Park & Wildwater Kingdom
- Scrambler - Edaville USA
- Scrambler - Enchanted Forest Water Safari
- Scrambler - Family Kingdom Amusement Park
- Scrambler - Fantasy Island Amusement Park (New Jersey)
- Scrambler - Fun Spot America (Orlando)
- Scrambler - Gillian's Wonderland Pier
- Scrambler - Hersheypark (1972–present)
- Scrambler - Huck Finn's Playland
- Scrambler - Idlewild and Soak Zone
- Scrambler - Indiana Beach
- Scrambler - Joyland Amusement Park
- Scrambler - Kings Dominion
- Scrambler - Kings Island (1972–present), originally operated at Coney Island, Cincinnati, Ohio (1957–1971)
- Scrambler - Lakemont Park
- Scrambler - Lakeside Amusement Park
- Scrambler - Lake Winnepesaukah
- Scrambler - Little Amerricka
- Scrambler - Michigan's Adventure
- Scrambler - Miracle Strip at Pier Park
- Scrambler - NASCAR Speedpark (Sevierville, TN)
- Scrambler - Oaks Amusement Park
- Scrambler - Playland (Vancouver)
- Scrambler - Sandy Lake Amusement Park
- Scrambler - Sandspit Amusement Park
- Scrambler - Sylvan Beach Amusement Park
- Scrambler - Silverwood Theme Park
- Scrambler - Six Flags Magic Mountain (2003–present)
- Scrambler - Six Flags New England (1973–present)
- Scrambler - Sluggers & Putters (Canal Fulton, OH)
- Scrambler - Stricker's Grove
- Scrambler - Traintown (Sonoma, California)
- Scrambler - Valleyfair (1976–present)
- Scrambler - Waldameer Park
- Scrambler - Western Playland
- Scrambler - Wild Waves Theme Park
- Scrambler - Wonderland Park (Texas)
- Scrambler - Worlds of Fun (1998–present)
- Shazam! - Six Flags St. Louis (1972–present)
- Sidewinder - Frontier City
- Sidewinder - Six Flags Over Texas (2006–present)
- Sizzler - Beech Bend Park (2015–Present), Originally opened in 2000, replaced by a new version of the same ride
- Sizzler - Brean Leisure Park
- Sizzler - Dizzylands Funfair - Elmer Bell (Northern Ireland)
- Space Scrambler - Lagoon
- Swedish Scrambler - Scandia Amusements (Sacramento)
- Twister - Clacton Pier
- Twister - Clarence Pier
- Twister - Dunes Leisure Funfair, Mablethorpe
- Twister - Fantasy Island
- Twister - Great Yarmouth Pleasure Beach
- Twister - Luna Park, Scarborough, North Yorkshire
- Twister - Magic City (São Paulo)
- Twister - Rainbow Park, Hunstanton
- Twister - Tramore Amusements (Tramore, Waterford, Ireland)
- Waverunner - Six Flags Fiesta Texas (1994–present)
- Whirling Wildcats - Wild Adventures
- "The Twist". University of Sheffield National Fairground Archive. Retrieved 2017-10-01.
- Canfield, Victor. "Scrambler". www.personal.psu.edu. Retrieved 2017-10-01.[better source needed]
- US patent 2259691, Richard H Harris, "Merry-go-round", issued 1941-10-21
- McHugh, Jim (1954-04-10). "Ride-Makers Sight Good '54 Business". The Billboard. p. 56. Retrieved 2017-10-01.
- Dotten, Herb (1955-03-05). "Shift Over, Kiddies! Let the Folks Ride". The Billboard. pp. 1, 39. Retrieved 2017-10-01.
- "The Big Eli Scramble". The Billboard (Photograph cutline). 1954-04-10. p. 89. Retrieved 2017-10-01.
- "Buys Twister, Adds Mechanical Circus; Will Work Two Scramblers". The Billboard. 1955-02-26. p. 70.
- "Scrambler". Ride Extravaganza Retrieved 2016-7-16
- Williamson, Elizabeth. "On Thrill Rides, Safety Is Optional - washingtonpost.com". Retrieved 18 May 2018 – via www.washingtonpost.com.
- Williams, David. "Girl dies after being flung from a ride at a New Jersey festival - cnn.com". Retrieved 13 Oct 2019.
- Sam Bee (13 May 2018). "Billy Crow's Cyclone (ARM Lifting Twist) offride (Dedicated to Fairgroundking1)". Retrieved 18 May 2018 – via YouTube.
- Sam Bee (12 May 2018). "Billy Crow's Cyclone (ARM Lifting Twist) onride (Dedicated to Fairgroundking1)". Retrieved 18 May 2018 – via YouTube.