Master LASERS in Portal Reloaded: Test Chambers 13-15

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Walkthrough

1
Test Chamber 13: Place portals as shown in the image to redirect the laser. Use a time portal to move the laser into the future. Travel through the time portal, potentially taking damage. Once in the future, rearrange portals to direct the laser into the target, then exit through the door.
2
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 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 move it through the time portal to the present. Adjust the present reflector cube to hit all three nodes. If necessary, return to the future to retrieve the future reflector cube again. Finally, place the future reflector cube at the end of the nodes to reflect the laser into the receiver, completing the chamber.
3
Test Chamber 15: 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. 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 the receiver. Return to the present. An elevating platform near the switch 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 reflector cube on the lip above the second receiver. Travel to the future. Retrieve the future reflector cube and enter the laser room. Place a time portal in the laser room to bring the future reflector cube into the present. Position it to reflect the laser into the second receiver through the node. To bypass the particle field again, 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 place a portal on the upper wall to hit the third receiver. Move the reflector cube onto the switch to complete the chamber.

Tips

In Test Chamber 13, you can take some damage from the laser to facilitate travel into the future.
In Test Chamber 14, ensure the reflector cube in the present is adjusted to hit all three nodes.
In Test Chamber 15, be mindful of the particle field and use time portals strategically to bypass it.
The explanation for Test Chamber 15 has been clarified based on community feedback: grab the redirection cube and move it onto the switch *before* firing the portal to hit the upper receiver. This action destroys the future cube, allowing the laser to pass through its original blocking point.