Portal 2 is a first-person perspective puzzle game. Players take the role of Chell in the single-player campaign, as one of two robots-Atlas and P-Body-in the cooperative campaign, or as a simplistic humanoid icon in community-developed puzzles. These four characters can explore and interact with the environment. Characters can withstand limited damage but will die after sustained injury. There is no penalty for falling onto a solid surface, but falling into bottomless pits or toxic pools kills the player character immediately. When Chell dies in the single-player game, the game restarts from a recent checkpoint; in the cooperative game, the robot respawns shortly afterwards without restarting the puzzle. The goal of both campaigns is to explore the Aperture Science Laboratory-a complicated, malleable mechanized maze. 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 objective is less clear.
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