Fireteam Zero is a cooperative game for up to four players who must cut a path through an endless swarm of deadly monsters in order to discover and defeat the ultimate evil behind them. Each player possesses a set of brutal combat skills that are represented by a deck of cards unique to that character. Play cards to devastate the creatures in your way, help your teammates survive the onslaught, or even reshape the tactical landscape with the proper application of explosive ordinance. The battle is fought across three maps of increasing difficulty, each one bringing more and tougher enemies than the last. Players must search for and complete mission objectives in order to progress and bring them one step closer to the final showdown.