USURP Vs. STATQUO

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 (taking damage is acceptable). In the future, rearrange portals to direct the laser into the target. Exit through the door.

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 then 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 via a time portal. Position the present reflector cube to hit all three nodes; adjust as needed. If the future reflector cube was moved, return to the future to retrieve it and bring it back to the present. Finally, position the future reflector cube at the end of the nodes 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. Proceed to the other side of the room and use another time portal to return to the present, now on the other side of the particle field. Place a new portal on the upper wall above the laser room to direct the laser to the first receiver. Travel to the future and place a portal on the small wall in the laser room to aim at the receiver. Return to the present. The laser should still be hitting the upper receiver, powering an elevating platform. Stand on the platform and shoot a time portal behind the node. This raises the platform, 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 return to the laser room in the present by placing a time portal. Position the cube to reflect the laser into the second receiver through the node. To bypass the particle field, use a portal on the other side or a time portal. Reach 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.