Portal 2 is a puzzle game presented from the first-person perspective. Players act as Chell in the single-player campaign and as one of two robots, Atlas and P-Body, in the co-operative campaign. All three can move, look, and interact with the environment. The character can withstand damage for a brief period but will die under sustained injury. There is no penalty for falling onto a solid surface, even at high speed, but falling into bottomless pits or pools of toxic liquid kills the player-character immediately. When Chell dies in the single-player game, the game restarts from a recent checkpoint; in the co-op game, the robotrespawns shortly afterwards without restarting the puzzle.The goal of both campaigns is to maneuver the character(s) through the Aperture Science facility. While most of the game takes place in modular "test chambers" with clearly-defined entrances and exits, other parts occur in behind-the-scenes areas where the objectives are less clear.
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