Reposition your portals so you have one under the companion cube drop and one on the wall nearby. Travel back to the future, you'll find that companion cube still bouncing. We'll need to use another companion cube to do so. It will continue to bounce across the bounce pads left and right until something stops it. Press the switch to drop a companion cube. Shoot a portal under the companion cube drop ahead and another onto one of the ceiling panels as shown in the image above. Start this test chamber by traveling to the present through a time portal. Jump across the railings to reach the next test chamber. Go through the portal and jump onto the railing of the platform you were on. Look ahead and shoot another portal as high up on the side wall as shown in the image above. Just shoot portals under them to make them fall and disable them.įollow the path up the stairs and look to the right. As we travel to the next test chamber, you'll see some turrets blocking your path. Go through the orange portal to cross the light bridge and complete this test chamber. Shoot a blue portal at the wall above the corridor with the second set of turrets, where the particle field was.Īfter following those precise instructions in that particular order, you should have a bridge heading to the exit in the future as shown in the image above.Shoot a time portal across from the orange portal so the light bridge goes through it.

Shoot a blue portal next to you while in the future and go through it to return to the end of the test chamber in the future.Shoot a time portal next to you to return to the future.Now shoot a blue portal at the top of the light bridge. Shoot a blue portal towards the switch and travel through the orange portal on the side wall, as shown in the image above. Keep an orange portal in the present at the exit.The next set of instructions have to be done in a very particular order: This will remove the particle field high above the second set of turrets and launch a companion cube towards you. Press the switch and quickly go through the portals to return to the end. It was between the first set of turrets and the second set of turrets. You won't need the light bridge for a bit so set up portals to return to the switch in the middle of this test chamber. You can now safely cross to the end of this test chamber, but there's still more to go! Use a time portal here to return to the present. Use another portal to extend the light bridge to block the right row of turrets as shown in the image above. It will go straight into the portal you have blocking the left path of turrets. Shoot a time portal to where the light bridge wall ends in the present to bring the light bridge into the future. In the future, you won't have any light bridge walls here. Shoot a time portal on one of the walls here so you can travel to the future. Shoot a portal along the left path to block the left row of turrets. You'll see two sets of turrets down the next path and a switch here. Pass by the turrets now that they're blocked. You have to shoot at the ceiling so you're looking at the edge of the light bridge to have the portal hit the ceiling properly. Start this chamber off by shooting a portal at the ceiling and one at the wall of turrets as shown in the image above.

Portal reloaded turrets