Police Maverick

Test Chamber 13: Place portals as shown to use a portal to move the laser sideways and a time portal to send it into the future. Travel through the time portal. Rearrange portals in the future so the laser hits the target. Head through the door.

Test Chamber 14: Travel to the present via a time portal. Summon a reflector cube and position it as shown. Use a portal to direct a laser through the first node, 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 hits the node. Bring the reflector cube from the future to the present. Adjust the present reflector cube to hit all three nodes. Travel back to the future to retrieve the future reflector cube if needed. Place the future reflector cube 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 the future to bypass the particle field. Head to the other side 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 to direct the laser to the first receiver. Travel to the future and place a portal in the laser room to shoot the receiver. Return to the present. An elevating platform will power up. Stand on it and shoot 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. Pick up the future reflector cube and run into the laser room. Place a time portal to bring the future reflector cube into the present laser room. Position it to reflect the laser through the node to the second receiver. To get past the particle field, use a portal on the other side or a time portal. Be in 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.