Gruppe Sechs Gear

Test Chamber 13: Place portals as shown to redirect the laser. Use a time portal to move the laser into the future. Then, rearrange portals in the future to direct the laser into the target, allowing you to exit.

Test Chamber 14: Travel to the present. Summon a reflector cube and position it as shown. Use a portal to bring a laser through the first node, then reflect it into the next two. Travel to the future. Use portals to bring a laser into the present through the time portal, ensuring it passes through the node. Retrieve the reflector cube from the future and bring it to the present. Adjust the present reflector cube to hit all three nodes. Travel back to the future to retrieve the future reflector cube if necessary. Finally, place the future reflector cube to reflect the laser into the receiver, completing the chamber.

Test Chamber 15: Start by going through the particle field to the left. Place a portal where the laser hits the wall and a time portal on the opposite wall. Travel through the time portal to the future to bypass the particle field. Return to the present using another time portal to be on the other side of the field. Place a portal on the upper wall to hit the first receiver. Travel to the future and place a portal on the small wall in the laser room to hit the second receiver. Return to the present. An elevating platform will power up. Stand on it and place a time portal behind the node to raise the platform further, allowing you to summon a reflector cube. Place this cube on the lip above the second receiver. Travel to the future. Retrieve the future reflector cube and bring it back to the present using a time portal in the laser room. Position it to reflect the laser into the second receiver through the node. To reach the other side of the particle field without passing through it, use a portal on the other side or a time portal. Once in the present on the other side, climb the stairs and use a portal on the upper wall to hit the third receiver. Finally, move the reflector cube onto the switch to complete the test chamber.