There are eleven single player levels in Crysis, seven in Crysis Warhead, eighteen in Crysis 2, and eight in Crysis 3 . Although these levels seem linear and straight forward, appearances can be deceptive. The Sandbox nature of the engine means there are multiple paths that cover all the options of pure firepower, vehicle usage and covert tactics. Some of the levels appear to have a time limit (the player's commander will hurry the player along) but actually this is not true and far more time can be taken over missions than it seems. (the only time there is an actual time limit is during Paradise Lost)