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In page Fighting game:

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Video game enthusiasts took an interest in fictional crossovers, which feature characters from multiple franchises in a particular game.[33] An early example of this type of fighting game is the 1996 arcade release X-Men vs. Street Fighter (which later became the Marvel vs. Capcom series), featuring comic book superheroes and characters from other Capcom games.[citation needed] In 1999, Nintendo released the first game in the Super Smash Bros. series, which allowed match-ups from various franchises, such as Pikachu vs. Mario.[33]