Grief

Grief mode, also referred to as 4z4 and Last Man Standing, is a playable mode in Call of Duty: Black Ops II ' s Zombie mode where matches of two to eight players in various team-sizes try to outlast each other in the zombie outbreak. The teams cannot directly harm one another but they can still hinder each other by blocking the enemy team's way or luring zombies towards them. Collected power-ups only reward the team that picks them up. Knifing an enemy player pushes them and slightly delays revive time.