Beat 'em up games
Beat 'em ups (or brawlers) are a related, but distinct genre to fighting games. While they both involve close-range combat, beat 'em ups put players against large waves of opponents as opposed to a few.
Beat 'em ups often incorporate mechanics from other action genres and multiplayer in beat 'em up games tend to be co-operative rather than competitive. Beat 'em ups saw a sudden decline in popularity in the early 1990s with the release of fighting games, but 3D beat 'em ups have kept the genre alive. Hack and Slash is a sub-genre often used to refer to weapons based beat 'em ups.