How to Beat Sodipud

Test Chamber 13: Place portals as shown in the image. Use a portal to redirect the laser sideways and 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 so the laser hits the target. Head 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 shown. Use a portal to bring a laser through the first node, then use the reflector cube to bounce 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 reflector cube in the present hits all three nodes; adjust its position if necessary. You may need to travel back to the future to retrieve the future reflector cube if you moved it. Finally, position the future reflector cube to reflect the laser into the receiver to complete the chamber.

Test Chamber 15: Start 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. 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 so the laser hits the first receiver. Travel back to the future and place a portal on the small wall in the laser room to shoot at the receiver. Return to the present; the laser should still hit the upper receiver, powering an elevating platform. Stand on the platform and shoot a time portal behind the node to raise the platform further, allowing you to summon a reflector cube. Place this reflector cube on the lip above the second receiver. Travel to the future. Retrieve the future reflector cube and return to the present by placing a time portal in the laser room. Position this cube to reflect the laser to the second receiver through the node. To proceed, you need to be in the present on the other side of the particle field. Use a portal to go through to the other side with the laser, 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. Finally, move the reflector cube onto the switch to complete the test chamber.