To The Local Bar

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 travel into the future. Once in the future, rearrange portals without affecting the present. Position portals so the laser hits the target, then proceed through the door.

Test Chamber 14: Start by taking a time portal to the present. Summon a reflector cube and position it in the present as shown. Use a portal to bring a laser through the first node, then use the reflector cube to direct the laser 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. Ensure the present reflector cube hits all three nodes; adjust as necessary. Return to the future to retrieve the future reflector cube if it was moved. Place the future reflector cube at the end of the nodes 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 the future to bypass the particle field. Head 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 so the laser hits 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 place a time portal behind the node to raise it, 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 bring it back to the present via a time portal in the laser room. Position it to reflect the laser through the node to the second receiver. To reach the other side of the particle field without going through it, use a portal on the other side or a time portal. You need to be in the present on the other side. 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.