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Chapter 1 - Incinerator
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This is the tenth level of the game, and takes place within one of the Aperture ScienceEmergency Intelligence Incinerators, as well as within a number of other dilapidated areas, including Test Chamber 19 from Portal. This level introduces the player to the dual-portal variant of the Aperture Science Handheld Portal Device, and the way in which two linked player-created Portals can be used to avoid obstacles. This level advances the storyline, and does not contain any significant Portal-based puzzles or obstacles.