Game Modes/Survival Mode

Survival Mode is a game mode that is available on the Half-Life Campaign and some other maps. When active, players who die will be respawned as observers, who observe the game in progress and will only be able to return once the living players have reached a checkpoint or until someone revives them. The result is an experience much more similar to Half-Life Singleplayer, where players can lose the level and must reload to try again.