Polysensory Unit

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. Rearrange portals in the future to direct the laser into the target and proceed through the door. You may take some damage from the laser to travel into the future.

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 direct a laser through the first node and reflect 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. Adjust the present reflector cube to hit all three nodes. If necessary, travel back to the future to retrieve the future reflector cube again. Position the future reflector cube 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. Return to the present using another time portal to be on the other side of the particle field. Place a portal on the upper wall to direct the laser to the first receiver. Travel to the future and place a portal on a small wall in the laser room to aim at the receiver. Return to the present; the laser should power an elevating platform. Stand on the platform and shoot a time portal behind the node to raise it 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 by placing a time portal in the laser room. Position this cube to reflect the laser into the second receiver through the node. To reach the other side of the particle field without going through it, use a portal on the other side or a 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. Finally, move the reflector cube onto the switch to complete the chamber.