Survival is a gamemode featured in Critical Strike Portable, where players must survive endless waves of zombies.
As Counter-Terrorists, players must defend themselves as long as possible against an endless horde of Zombies, the occasional Kamikaze and be the last one standing. Unlike Zombie Mode, when a player is killed, he/she loses the match and has to watch other players survive until one player is the last one standing.
Due to the large amount of zombies, players are given the option to buy Barricades. Players cannot hide in a spot where zombies cannot attack them, or they will get their health taken as a penalty. There are no winners in Single Player or if there is only one player in the game.