After the massive success of Sonic the Hedgehog, there was a mass outbreak of uninspired rip-off platformers with attempted mascots like Bubsy or Awesome Possum.They became so common that it took really gimmicky machines like Gunblade to stand out.
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A huge number of movie licenses were made on this template, usually adding a few "gimmick" levels involving something the player character does in the movie (driving, flying, climbing, skiing, etc). The character is often tasked with searching the level to find enough things to open a thing, with occasional interruptions from bosses. The standard was usually a multi-directional scrolling game viewed from a side-on perspective, with doors in the background leading to other rooms, with the player character either jumping on heads, using an appallingly programmed punch attack or having an extremely mediocre projectile weapon.
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Usually, this also has to do with which game type represents the formula for a game that requires the least effort to produce and is hardest to mess up. While this is normally harmless, and there is nothing wrong with having more options on a genre, this can get to the point where everyone is trying to make the same game, resulting in there effectively too many of the same type of game while other genres are left ignored. Whenever a game or a genre becomes extremely popular in gaming (and other forms of media for that matter), others see the success and attempt to make similar games to capitalize on it, sometimes to the point of making direct rip-offs.