1986's Nekketsu Kōha Kunio-kun introduced the belt scroll format employed extensively by later games, while also popularizing contemporary urban settings, while its Western localized version Renegade further introduced underworld revenge themes. The first beat 'em up was 1984's Kung-Fu Master, which was based on Hong Kong martial arts films. Most of these games take place in urban settings and feature crime-fighting and revenge-based plots, though some games may employ historical, science fiction or fantasy themes. Two-player cooperative gameplay and multiple player characters are also hallmarks of the genre. The gameplay tends to follow arcade genre conventions, such as being simple to learn but difficult to master, and the combat system tends to be more highly developed than other side-scrolling action games. Traditional beat 'em ups take place in scrolling, two-dimensional (2D) levels, while a number of modern games feature more open three-dimensional (3D) environments with yet larger numbers of enemies. Subgenre of action game featuring hand-to-hand combatsīeat 'em up (also known as brawler and, in some markets, beat 'em all ) is a video game genre featuring hand-to-hand combat between the protagonist and an improbably large number of opponents.

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