Fire a blue portal onto the light-colored patch of ceiling that overhangs the moving platform's track. The second weighted storage cube is on a moving platform (the platform was activated by the high energy pellet receptor earlier). Shoot an orange portal onto a nearby wall and drop the weighted storage cube through the portal to land on the elevated floor switch. To place it on the first red floor switch, fire a blue portal onto the ceiling directly over the elevated platform (there's a white square panel on the ceiling that marks where you should place the portal). You should have one weighted storage cube already, carried over from the first part of the testchamber. There are two red floor switches in the room, and both are located on elevated platforms on the left side of the room. The pellet should pass through the portals and enter the receptor on the ground. Now place the orange portal on top of the black pock mark that's made by the bouncing high energy pellet. You can spot a faint light on the ceiling that'll serve as a guide for where to place the blue portal. Fire a blue portal onto the ceiling, directly over the energy pellet receptor that's on the ground. There's a bouncing high energy pellet in the room that's worth taking care of now to avoid future problems.
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