Super Guns, Skull Bombs and shields. Players can also find hostages and free them throughout the game for extra points. At the end of each stage, the players receive bonus points based on the number of enemies killed and hostages rescued, as well as the amount of damage done. The five members of Aerosmith are hidden in secret locations throughout the game. When found, each member presents the player with a set of Aerosmith wings that increase the end-of-stage bonus. All members must be found in order to unlock the best ending and bonus level, in which the players go backstage after blowing up Helga, and can collect high-value Mammy Awards, as well as party with the band. Development and release Mortal Kombat II features an advertisement with the old Revolution X logo that arcade operators could toggle on and off. Occasionally after a large in-game explosion, Steven Tyler can be heard saying "Toasty!" in a high-pitched voice in reference to an easter egg in Mortal Kombat II. The game was originally developed as a title based on the film Jurassic Park. However, Sega acquired the rights instead and eventually released its own arcade game based on the film. Midway then retooled its concept to revolve around Aerosmith. The first release labeled Proto 5.0 (5/23/1994) is lacking several speech samples spoken by members of Aerosmith which can be heard after collecting power-ups and has a shorter Pacific Rim level. Revision 1.0 (6/16/1994) restored the missing speech samples and has the complete Pacific Rim level and completed two new crosshairs in P2 and P3. Revolution X was released as upright two player and deluxe three player arcade units and as a conversion kit for existing gun games such as Terminator 2: The Arcade Game. Another Revolution X featuring the hip-hop group Public Enemy was considered, but reportedly scrapped after the negative reception that the home versions of the original Revolution X received. Soundtrack The soundtrack consists of several Aerosmith songs continuously looped, including "Eat the Rich", "Sweet Emotion", "Toys in the Attic", and "Walk This Way". A Muzak version of "Love in an Elevator" plays in the elevator part of the Amazon Jungle level. The soundtrack was featured in the CD Offer after playing or during attract mode. The console versions include loops of "Rag Doll" for the attract screen, main menu, and score, "Fever" for the Middle East level, and