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Detailed walkthrough for Portal Reloaded's Laser challenges in Test Chambers 13, 14, and 15. Learn to manipulate lasers and time portals to solve complex puzzles.

This section of the Portal Reloaded walkthrough covers Test Chambers 13, 14, and 15, 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 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

Begin by taking a time portal to the present. Summon a reflector cube and position it in the present as shown. Use a portal to bring a laser through the first node, then use it to reflect the laser 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. Position the present reflector cube to hit all three nodes. Adjust as needed. Travel back to the future to bring the future reflector cube to the present if you moved it. 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

This chamber requires frequent use of the time portal. 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 above the laser room so the laser hits the first receiver. Travel back to the future and place a portal on the small wall in the laser room to shoot at the receiver. Return to the present; the laser should still be hitting the first receiver, powering an elevating platform. Stand on the platform and shoot a time portal behind the node. This will raise the platform, allowing you to summon a reflector cube. Place this cube on the lip above the second receiver. Travel to the future. Pick up the future reflector cube and enter the laser room. Place another time portal in the laser room to bring the future reflector cube to the present. Position it to reflect the laser into the second receiver through the node. Now, get to the other side of the particle field without going through it (use a portal or time portal). You need to be in the present on the other side. Climb the stairs and use a portal on the upper wall to hit the third receiver. Move the reflector cube onto the switch to complete the chamber.