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Chapter 1 - Incinerator Room
This is the ninth level of the game, and takes place within a Test Chamber and the Incinerator Room. 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. This level corresponds with Test Chamber 19 from the original Portal.
After acquiring the dual-portal device, place a portal on the far wall and the opposite portal on a nearby wall.
Once through, fire a portal past the wrecked wall and pass through it. Continue walking until a panel is visible to the right. Place a portal on it and pass through it
Continue walking until a ledge to the right is visible, place portals to reach this area. Opposite this ledge is a destroyed test chamber with panels hanging from the ceiling; place portals to enter this area.