Find The TEU Droid

Test Chamber 13: Place portals as shown to redirect the laser. Use a time portal to move the laser into the future. Travel through the time portal, rearrange portals in the future to direct the laser into the target, and exit the chamber.

Test Chamber 14: Travel to the present via a time portal. Summon a reflector cube and position it to redirect the laser through the first node. Use a portal to send the laser to the next two nodes. Travel to the future. Use portals to bring the laser back to the present through the time portal and ensure 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 the future reflector cube to the present via a time portal. Position it 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 bypass the particle field in the future. Return to the present using another time portal 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 to direct the laser to 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 the reflector cube on the lip above the second receiver. Travel to the future. Retrieve the future reflector cube and bring it to the present via a time portal. Position it to reflect the laser to the second receiver through the node. Return 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.