WWF No Mercy (USA) (Rev 1), known as WWF Wrestlemania 2000 (Japan) in Japan, is a professional wrestling video game released in 1999 for the Nintendo 64 console. Developed by Asmik Ace Entertainment and published by THQ, the game is based on the World Wrestling Federation (WWF) professional wrestling promotion and is part of the WWF No Mercy series. The game features a wide selection of wrestlers from the WWF roster, including The Rock, Stone Cold Steve Austin, The Undertaker, Kane, and Mankind. Players can choose to play as any of the wrestlers in the game, and can compete in a variety of match types, including singles, tag team, and battle royal matches. Players can also create their own wrestlers and customize their move sets, costumes, and entrances. WWF No Mercy also features a story mode, where players can compete in a series of matches to become the WWF champion. The game also has a variety of unlockable features, including hidden wrestlers, arenas, and cheat codes. The game was well-received, with critics praising its graphics, gameplay, and the variety of match types available. It has since become a cult classic and is considered one of the best wrestling games ever made.