Talk With Lysistrata

Test Chamber 13: Place portals as shown to redirect the laser. Use a time portal to move the laser into the future. Enter the time portal to proceed. Rearrange portals in the future to direct the laser into the target, then exit through the door.

Test Chamber 14: Travel to the present via a time portal. Summon and position a reflector cube in the present to direct the laser through the first node. Use a portal to bring the laser through this node. Travel to the future. Use portals to bring a laser into the present through the time portal, ensuring it hits the node. Retrieve the reflector cube from the future and bring it to the present via a time portal. Position the present reflector cube to hit all three nodes. Return to the future to retrieve the future reflector cube. Bring it back to the present via a time portal and position it to reflect the laser into the receiver, completing the chamber.

Test Chamber 15: Traverse the particle field by placing a portal on the wall and a time portal on the opposite wall. Enter the time portal to move to the future, bypassing the field. Use another time portal to return to the present on the other side of the field. Place a portal to direct the laser to the first receiver. Travel to the future and place a portal in the laser room to aim at the receiver. Return to the present. An elevating platform will activate; 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 cube above the second receiver. Travel to the future, retrieve the future reflector cube, and bring it back to the present via a time portal in the laser room. Position it to reflect the laser into the second receiver through the node. To reach the other side of the particle field without passing through it, use a portal on the other side or a time portal. Once on the other side in the present, 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 test chamber.