Quest For Lixir

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 present portals to guide 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 direct the laser through the first node. Travel to the future. Use portals to bring the laser back to the present through the node. Bring the reflector cube from the future to the present. Ensure the present reflector cube hits all three nodes, adjusting as necessary. Return to the future to retrieve the future reflector cube if needed. Position the future reflector cube to direct the laser into the receiver and complete 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. Head to the other side and use another time portal to return to the present, now past the particle field. Place a portal to direct the laser to the first receiver. Travel to the future and place a portal to shoot the receiver. Return to the present; an elevating platform will power up. Stand on it and 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 back to the present via a time portal in the laser room. Position it to reflect the laser into the second receiver through the node. To reach the other side of the particle field without going through it, use an existing portal or a time portal. 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. Finally, move the reflector cube onto the switch to complete the test chamber.