Zombie Siege 2 Top Secret Files Cooperation Mode

In Zombie Surge 2, players needed to work with other players to fight against the zombies. In the top-secret file, players could team up with other players to explore the map, collect resources, attack zombies, and so on. To activate the Co-op Mode, players needed to complete a specific mission in the game to obtain a special item, the Co-op Mode Activation Code. After completing the mission, the player needed to exchange for the activation code at a specific location in the game and enter the activation code to activate the cooperative mode. In the cooperative mode, players needed to work together to effectively resist the zombie attacks. For example, one player was responsible for attacking zombies, another player was responsible for collecting resources, and the third player was responsible for taking care of injured or dead teammates. Players needed to cooperate and help each other to win. In the cooperative mode, players could also team up with other players to challenge higher difficulty levels to obtain more rewards and experience points.