Talk With Flateus Dan

Test Chamber 13: Place portals as shown to redirect the laser. Use a portal to move the laser sideways and a time portal to send it into the future. Travel through the time portal (taking some damage is okay). In the future, rearrange portals to direct the laser into the target. Head through the door.

Test Chamber 14: Travel to the present via 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 passes through the node. Retrieve the reflector cube from the future and bring it to the present via a time portal. Ensure the present reflector cube hits all three nodes; adjust as needed. Return to the future to retrieve the future reflector cube if you moved it. Place the future reflector cube in the present to reflect the laser into the receiver, completing the chamber.

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 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 so the laser hits the first receiver. Travel to the future and place a portal on the small wall in the laser room to hit 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, 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 another time portal in the laser room to bring the future reflector cube into the present. Position it to reflect the laser to 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, 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.