Grab the cube from its station and place it on the giant red button below the reactor.This will activate the last of the reactors. Stand above the cube, face back towards the left room, and place the orange portal at the top of the wall. Head up the new stairway provided in the clean world.Then, go through the green portal which is on the right from the start of the stage. Instead, leave it in the middle of the Chamber. Don’t put the cube on the button just yet. Place the orange portal somewhere outside of the left room and head through the blue portal to gain access to the main room without needing to head through the green portal again. Here’s what you need to do: Get the First Cube After getting to Chamber 4, simply take a left to where you can spawn a cube.Place the cube in view of the miasma doorway at an angle to send the laser through the door and into the other floor cone. Create a green portal in this room and bring the cube through the portal.
Create another green portal outside of the room to head back into the previous timeline where everything is working. A detailed guide to all 25 levels of the popular Reloaded fan mod for Portal 2 The main feature of this free modification for the game Portal 2 (do not forget that you still need to purchase the Steam version of the second part to launch it) - in addition to the two usual portals (blue and orange), a time portal appears.Create a green portal anywhere in this room to leave it in the other timeline.Place an oval-shaped portal at the left end of this room for the laser to shoot into.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.