A "Beat 'Em Up" is a genre of video games where players control characters to fight against waves of enemies. The gameplay typically involves hand-to-hand combat, using punches, kicks, and special moves to defeat opponents. Players often progress through levels, facing increasingly difficult foes and sometimes culminating in a boss battle. These games can be played solo or cooperatively with friends, enhancing the experience through teamwork. Popular examples of the genre include Streets of Rage, Final Fight, and Double Dragon. The genre has evolved over the years, incorporating various elements like storylines and character upgrades.