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Navigate Test Chambers 13, 14, and 15 in Portal Reloaded using lasers, time portals, and reflector cubes. Master advanced laser puzzles with this detailed walkthrough.

This guide covers Test Chambers 13, 14, and 15 of Portal Reloaded, focusing on the use of lasers and time portals to solve puzzles.

Test Chamber 13

Place portals as shown in the image. Use a portal to move the laser sideways and a time portal to send it into the future. You can take some damage from the laser to travel into the future. Once in the future, rearrange portals so the laser goes directly into the target to exit the chamber.

Test Chamber 14

First, travel to the present using a time portal. Summon a reflector cube from the central switch and position it in the present as shown. Use a portal to bring a laser through the first node, then use the reflector cube to direct it into the next two nodes. 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 via a time portal. Position the present reflector cube to hit all three nodes. If necessary, travel back to the future to retrieve the future reflector cube and bring it to the present again. Finally, place the future reflector cube at the end of the nodes 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 reach the future, bypassing the particle field. Head to the other side of the room and use another time portal to return to the present, now on the other side of the particle field. Place a new portal on the upper wall so the laser hits the first receiver. Travel to the future and place a portal on the small wall in the laser room to aim at the receiver. Return to the present. An elevating platform near the switch will power up. Stand on it and shoot 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 and retrieve the future reflector cube. Use a time portal in the laser room to bring the future reflector cube to the present. Position it to reflect the laser through the node and into the second receiver. To proceed, you need to be in the present on the other side of the particle field. 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.