Superheroes 2000 is a 2D fighting video game built with M.U.G.E.N. that brings together more than 350 Marvel and DC heroes and villains for battle. It offers fast-pased, combo-filled gameplay and unique tag-team specials for each character, with several different modes, including Arcade, 2-on-2 and Survival. The game first began development in 2007 and includes freeware assets and contributions shared among the gaming community. Dozens of characters have continued to be added and updated over the years.