Prologue: The Day begins

An ordinary day becomes a horrific quest for survival when 80 employees at the WVBA Headquarters in New York, New York, learn that they are pawns in a deadly game. Trapped inside their building, a voice over an intercom tells the frightened boxers and staff that two workers must be killed within 30 minutes. When another ultimatum follows, friends become enemies and new alliances take shape, as only the strongest will remain alive at the end.

((ripped right from the synopsis I know))
(basically Punch-Out x The Belko Experiment)