In late 1993, after the multiplayer component was coded, the development team began playing four-player multiplayer games matches, which Romero termed "deathmatch"; he proposed adding a cooperative multiplayer mode as well. According to Romero, the deathmatch mode was inspired by fighting games. The team frequently played "", "Fatal Fury" and "Art of Fighting" during breaks, while developing elaborate rules involving trash-talk and smashing furniture or equipment. Romero later stated that "you could say that Japanese fighting games fueled the creative impulse to create "deathmatch" in our shooters".