WWF No Mercy is a professional wrestling video game developed by Asmik Ace Entertainment and released for the Nintendo 64 (N64) in Japan as WWF WrestleMania 2000 (WWFレッスルマニア2000). It is the sequel to WWF WrestleMania 2000 and the fourth installment in the WWF SmackDown! series. The game features a variety of wrestlers from the World Wrestling Federation (WWF) and is based on the professional wrestling promotion's annual pay-per-view event, No Mercy. WWF No Mercy includes a variety of single-player and multiplayer game modes, including exhibition matches, tournament mode, and a story-driven career mode. Exhibition matches allow players to customize the rules and stipulations of the match, while tournament mode allows players to compete in a single-elimination tournament. The game's career mode follows the player's created wrestler as they compete in matches and storylines in order to become the WWF Champion. WWF No Mercy features a variety of match types, including singles, tag team, triple threat, fatal four-way, king of the ring, and battle royal. Players can also customize the rules and stipulations of the match, such as ladder matches, cage matches, and hardcore matches. The game also includes a variety of weapons and objects, such as chairs and tables, that players can use to attack their opponents. WWF No Mercy is widely considered to be one of the best wrestling games of all time, and it is still played by fans of the series. The game was praised for its graphics, gameplay, and depth, and it has been cited as an influence on later wrestling games.