Start by selecting your game mode from the selection. Choose your gun and modify it with add-ons for better performance. Navigate through the tunnel using the control pad. Target at zombies using the crosshair and shoot to eliminate them. Endure as long as possible in the last stand or compete against enemies in TDM. Pick up weapons scattered around the map to keep fighting. Cooperate with teammates in multiplayer mode to achieve victory. Adapt your strategy based on the challenge and opponent actions.