This mode requires players to cooperative to finish the map's preset goal. In most cases, the map contains NPC-controlled Zombies confronting players and they must be killed/dodged to process on.
The hordes in Zombies can be either mutants or zombies, but both are programmed to defeat human players, which means they can't jump off/drop-down ledge or jump corner to get to the upper level. Some zombies, however, can go anywhere around the map including slopes, inclines that players cannot climb.
Bosses are the main guardian of most Zombie Mode maps that players will confront at various waves (usually the last one) and must be defeated to win the match.
Main artcle: Zombie Mode/Items
To aid players in their quest, there are many items exclusive to Zombie Mode that increases their chance to succeed significantly, be it reducing damage taken, HP recovery, Revive tokens, etc... Most of these items can be obtained for free by playing ZM, while some are only available via the Item Shop or VVIP System.
Rewards are the prizes of the maps obtained by gaining a certain score, collecting 5 Boss Tokens, or gaining the match's rate (SS, S+, A, B,...). The rewards are various, including the corresponding types of equipment, temporary character, and temporary/permanent weapons.
AI Ticket is an item that allows players to obtain various prizes, including permanent characters and weapons in Zombie Mode. Players simply need to shoot the zombie to collect the prizes with random chance.
Originally, this mode was known as Challenge Mode. Since the arrival of several new modes, it has been broken into several sub-mode as listed below.
Players get points for shooting/killing zombies/bosses, and these will be used to rank their result at the end of the match, which is sometimes used to determine Reward Crates tier. Equipping certain VVIP Weapons will boost player's scores significantly, allowing for a higher chance to earn the best Reward Crates.