Torpedo ECU

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. You may take some damage to ensure you travel into the future. Once in the future, rearrange portals to direct the laser into the target, then proceed through the exit door.

Test Chamber 14: First, travel to the present using a time portal. Summon a reflector cube and position it in the present as indicated. Use a portal to direct a laser through the first node, then use this laser to reflect into the next two nodes. Travel to the future. In the future, use portals to direct a laser into the present through the time portal, ensuring it passes through the designated node. Retrieve the reflector cube from the future and bring it to the present via a time portal. Adjust the present reflector cube to hit all three nodes. If necessary, return to the future to retrieve the future reflector cube again and bring it to the present. Finally, position the future reflector cube to reflect the laser into the receiver, completing the chamber.

Test Chamber 15: Begin by passing 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. On the other side, use another time portal to return to the present. Place a new portal on the upper wall above the laser room to direct the laser to the first receiver. Travel back to the future and place a portal in the laser room to shoot at the receiver. Return to the present; the laser should now be hitting the first receiver, powering an elevating platform. Stand on this platform and 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 and retrieve the future reflector cube. Bring it back to the present via a time portal within the laser room. Position this cube to reflect the laser into the second receiver through the node. To proceed, you need to be in the present on the other side of the particle field. If you have a portal on the other side, use it, or use a time portal to bypass the 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 test chamber.