Rockin' Tug is a flat ride manufactured by Zamperla.
 The ride is manufactured in both traveling and park versions.
 It is the first of a line of new "halfpiperides".
 Zamperla's Disk-O is another popular ride from that "family".
 The difference is that the Tug has a friction wheel, while the Disk-O is powered driven.
A Waltzer is a flat fairground ride that often forms the centrepiece of traditional Scottish and English fairs.
 The ride consists of a number of cars which spin freely while rotating around a central point, in much the same way as a carousel.
 As the cars revolve, the floor of the ride undulates over a track so that the cars rise and fall gently as the ride spins.
 The offset weight of the riders causes each car to rotate.
 The riders experience varying levels of g-force from the spinning of the car, and the rotation of the ride itself.
 Because of this it is suitable for young people and adults – operators will impose height and age restrictions.
A Madhouse is a flat ride manufactured by Vekoma.
 The ride is designed to be an optical and physical illusion, consisting of several rows of seats attached to a swaying gondola within a rotating drum.
 The ride creates the impression that the rider is turning upside down, whereas it is actually the room that is moving around them.
A flat ride cymbal or flat top ride (or often just flat ride) is a ride cymbal without a bell, originally developed by Paiste in collaboration with jazz drummer Joe Morello as part of their Formula 602 series in the 1960s.
 The most common size is 20" followed by 18", but larger examples exist.
The Crypt was an indoor Giant Top Spin flat ride located at Kings Island amusement park in Mason, Ohio.
 Originally constructed by former owners Paramount Parks, the ride officially opened as Tomb Raider: The Ride on April 5, 2002.
 It featured numerous special effects in relation to the theme of the 2001 Paramount film, "".
 Following the 2007 season, new park owner Cedar Fair removed all references to the film from both the ride and its indoor queue line.
 The name was also changed to "The Crypt".
A swing boat, colloquially known as a "shuggy boat" in the north east of England, is a fairground ride in which pairs of riders pull ropes to swing back and forth.
 A similar ride called a pirate ship swings in a similar motion but without the rider pulling on ropes.
The Paratrooper, also known as the "Parachute Ride" or "Umbrella Ride", is a type of fairground ride based on the seats suspended below a wheel which rotates at an oblique angle.
 The seats are free to rock sideways and swing out under centrifugal force as the wheel rotates.
 Invariably, the seats on the Paratrooper ride have a round shaped umbrella or other shaped canopy above the seats.
 In contrast to modern thrill rides, the Paratrooper is a ride suitable for almost all ages, except for infants and very small children.
Storm Surge is a 'Spinning Rapids' water ride at Thorpe Park, Surrey, United Kingdom manufactured by WhiteWater West.
 It is located in the Amity area of the park, in the vicinity of the park's Tidal Wave-themed ride.
 Storm Surge, which opened in March 2011 with a fairground ride theme, makes use of the Tidal Wave water which has washed into Amity, as the town enters the 1970s.
 The ride was relocated from the transforming "Cypress Gardens Florida, which was acquired by Merlin Entertainments to be turned into Legoland Florida.
The swing ride or chair swing ride (sometimes called a swing carousel, wave swinger, yo-yo, Chair-O-Planes or swinger) is a fairground ride that is a variation on the carousel in which the chairs are suspended from the rotating top of the carousel.
 On some versions, particularly on the Wave Swingers, the rotating top of the carousel also tilts for additional variations of motion.
Tilt-A-Whirl is a flat ride similar to the Waltzer in Europe, designed for commercial use at amusement parks, fairs, and carnivals, in which it is commonly found.
 The rides are manufactured by Larson International of Plainview, Texas.

Question: Tilt-A-Whirl is a flat ride and is similar to what other flat fairground ride?
Answer: Waltzer