Thermal Charges

Test Chamber 13: Place portals as shown 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 exit the chamber.

Test Chamber 14: Travel to the present and summon a reflector cube. Position it to direct the laser through the first node. Travel to the future. Use portals to bring the laser back to the present 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. Travel back to the future, then return to the present. Place the future reflector cube to direct the laser into the receiver.

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 bypass the particle field. Return to the present using another time portal. Place a portal on the upper wall to direct the laser to the first receiver. Travel to the future, place a portal in the laser room to shoot the receiver. Return to the present. Stand on the elevating platform. Place 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. Retrieve the future reflector cube and bring it to the present using a time portal in the laser room. Position it to reflect the laser into the second receiver through the node. Travel to 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. Move the reflector cube onto the switch to complete the chamber.