Missable Achievement/Trophy Alert!: Overclocker¶
Once you enter the Chamber, turn around and look up at the high wall in front of you. Fire your first portal (the exit one) up at the top and then turn around.
Move forwards until you reach the trench, look down and fire the other portal at the ground here and fall in. The momentum will carry you across over to the Companion Cube resting on the ledge. Pick it up and then fall back down through the portal below you.
Once you’re back on the main floor, stand on the jump pad and you’ll hit the glass wall on the middle level. Place your Companion Cube in front of the laser to break it, dropping the barrier behind you.
Look up into the top right-hand corner of the room and on the white bit of wall here, fire a portal over here (it should be right across from where your Companion Cube is sitting). Now drop down and run over the jump pad again to be taken up to the upper floor.
Once you’re back on the main floor, stand on the jump pad and you’ll hit the glass wall on the middle level. Place your Companion Cube in front of the laser to break it, dropping the barrier behind you.
Turn around and stand in the middle facing the jump pads (looking towards the exit). A Displacement Cube will come bouncing up towards you, so grab it, then drop down to the middle level below you.
There’s a conveniently placed white wall to the left of the red plunger, so place your second portal here and then hit the red button.
Now simply drop back down to the ground floor (with your Companion Cube in tow), hit the jump pad and watch as you’re carried towards the exit. Set the Cube down on the large red button to open the exit behind you.
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