Master LASERS in Portal Reloaded: Test Chambers 13-15

AntMag.NET

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 may take some damage to travel into the future. Once in the future, rearrange portals so the laser hits the target. Exit the chamber.
2
Test Chamber 14: First, 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, 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. 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 to reflect the laser into the receiver, completing the chamber.
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 opposite 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 so the laser hits the first receiver. Travel back to the future and place a portal in the laser room to direct the laser to the second 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. This raises the platform, allowing you to summon a reflector cube. Place this cube on the lip above the second receiver. Travel to the future. Retrieve the future reflector cube and run into the laser room. Place a 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 existing portals or a time portal). In the present, 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, taking some damage from the laser is acceptable to travel into the future.
In Test Chamber 14, ensure the reflector cube in the present is correctly positioned to hit all three nodes. You may need to bring the future reflector cube to the present multiple times.
In Test Chamber 15, be mindful of the particle field; use time portals strategically to bypass it. Pay close attention to the placement of reflector cubes and portals to hit all receivers. The interaction between moving cubes and future cubes is crucial for solving the puzzle.