Guide LASERS: Test Chambers 13-15

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Walkthrough

1
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 hits the target.
2
Test Chamber 14: Travel to the present using a time portal. Summon a reflector cube and position it in the present as shown. Use a portal to bring a laser through the first node and 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 hits the node. Pick up the reflector cube from the future and bring it to the present via the time portal. Ensure the present reflector cube hits all three nodes, adjusting as necessary. Travel back to the future to bring the future reflector cube to the present if needed. Place the future reflector cube at the end of the nodes to reflect the laser into the receiver.
3
Test Chamber 15: Go through the particle field to the left. Place a portal where the laser hits the wall and a time portal on the other wall. Travel through the time portal to the future to bypass 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 field. Place a new portal on the upper wall above the laser room so the laser hits the first receiver. Travel 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 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. Pick up the future reflector cube and bring it to the present via a time portal in the laser room, positioning it to reflect the laser into the second receiver through the node. To get to the other side of the particle field, use a portal or 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. Move the reflector cube onto the switch to complete the chamber.

Tips

In Test Chamber 13, you can take damage from the laser to travel into the future.
In Test Chamber 14, ensure the reflector cube in the present hits all three nodes.
In Test Chamber 15, you may need to travel between present and future multiple times to position cubes and lasers correctly. Be mindful of the particle field and how to bypass it.