A fighting game is a video game genre in which the player controls an on-screen character and engages in close combat with an opponent, which can be either an AI or controlled by another player. The fight matches typically consist of several rounds and take place in an arena, while each character has widely differing abilities but each is relatively viable to choose. Players must master techniques such as blocking, counter-attacking, and chaining attacks together into “combos”. Since the early 1990s, most fighting games allow the player to execute special attacks by performing specific input combinations. The fighting game genre is related to but distinct from beat ’em ups, which involve large numbers of enemies against the human player.