Begin by selecting your preferred mode from the 5 available options. Choose your firearm and upgrade it with attachments for better performance. Walk through the tunnel using the control pad. Target at enemies using the targeting system and attack to defeat them. Endure as long as possible in the endurance challenge or battle against enemies in TDM. Gather ammo scattered around the map to keep fighting. Cooperate with friends in team games to dominate the game. Change your approach based on the challenge and zombie patterns.