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Navigate Portal Reloaded's challenging laser puzzles in Test Chambers 13, 14, and 15. Learn how to manipulate lasers and time portals to solve these complex chambers.

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: Start by placing portals as shown in the image. Use a portal to redirect the laser sideways and a time portal to send it into the future. You may need to take some damage from the laser to travel into the future. Once in the future, rearrange the portals so the laser hits the target. Then, proceed through the exit door.

Test Chamber 14: Begin by traveling to the present using a time portal. Summon a reflector cube and position it in the present as indicated. Use a portal to direct a laser through the first node, then use the reflector cube to guide it through the next two nodes. Travel to the future. In the future, use portals to bring a laser into the present, ensuring it passes through the designated node. Retrieve the reflector cube from the future and bring it to the present via a time portal. Adjust the present reflector cube to hit all three nodes. If necessary, return to the future to reposition the future reflector cube. Finally, place the future reflector cube to direct the laser into the receiver, completing the chamber.

Test Chamber 15: This chamber requires frequent use of time portals. Start by passing 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. Return to the present using another time portal to be 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. The laser should now be hitting the first receiver, powering an elevating platform. Stand on the platform and place a time portal behind the node to raise it further, allowing you to summon a reflector cube. Place this cube on the lip above the second receiver. Travel to the future and bring the future reflector cube back to the present via a time portal within the laser room. Position it to direct the laser to the second receiver through the node. To proceed past the particle field, use a portal on the other side or a time portal. Reach the present on the other side of the particle field. 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 chamber.