![]() This will activate the last of the reactors. Stand on the cube, look into the room on the left, and place the orange portal on top of the wall. Climb the new ladder provided in the clean world.Place the orange portal somewhere outside the room on the left and head through the blue portal to gain access to the main room without needing to go through the green portal again.Position the cube within sight of the miasma entrance at an angle to send the laser through the door and into the other cone on the floor. Create a green portal in this room and take the cube through the portal. In the ruined timeline, take the cube to the room on the left.Take the cube to the drop-off point on the other ledge and head through another green portal. Press the red button on the right side to receive a cube.This will lift the four tiles the player is standing on and place them on a previously inaccessible ledge. While standing on this floor piece, turn to the cone on the floor and place the green portal on the wall behind it to activate the cone.Walk to the square outlined on the floor near the wall that players face when they first enter the room. Go back through the green portal to the workroom to see that the portal has not moved in this dimension.This will activate the cone on the floor in this dimension / Head through the green portal once more and create another one of the orange oval shaped portals on the wall opposite the window on the right inside the room on the left.This will activate the receiver on the opposite wall. Above the window to the right of the blue miasma entrance, create an orange oval-shaped secondary portal.Create another green portal outside the room to return to the previous timeline where everything is working.Create a green portal anywhere in this room to drop it on the other timeline.Place an oval shaped portal at the far left of this room for the laser to fire.After entering Chamber 15, head through the blue miasma door on the left.For Chamber 15 in particular, there are quite a few steps but with minimal use of the third green portal.
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