Quickly fire a blue portal onto one of the black park marks on the wall to warp the energy pellet out of the hall. Further down the hall is a high energy pellet bouncing between the very narrowly spaced walls, directly in your way. Think quickly, 'cause there's another danger just around the corner. Peek through a nearby orange portal and wait for a moving platform to pass in front of the portal exit you just created to bypass the closed door. Press the switch and then quickly fire a blue portal through the doorway and onto one of the walls of the hall beyond. The switch in this small alove temporarily opens a door in the hall, though the door closes too quickly for you to pass through while riding the moving platform. Pass back through the nearby blue portal to reach the alcove. You can spot an alcove to the left into which you can fire an orange portal.
Pass through a nearby orange portal to reach the platform, then look left down the hall. You can wait for the platform and ride it through the hall, or you can warp to a stationary platform that's further down the hall by firing a blue portal onto the wall above the platform. Go to the other side of the room to find a hall with an electrified track for a moving platform.
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