In-App Purchase Breakdown & Value

Test Chamber 13: Place portals as shown in the image. Use a portal to redirect the laser and a time portal to move the laser into the future. Enter the time portal to advance. In the future, rearrange portals to direct the laser into the target, then exit the chamber.

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 passes through the node. Retrieve the reflector cube from the future and bring it to the present. Adjust the reflector cube in the present to hit all three nodes. If necessary, return to the future to retrieve the cube again. Finally, position the future reflector cube to direct the laser into the receiver, completing the chamber.

Test Chamber 15: Enter 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. 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 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 aim at the receiver. Return to the present; the laser should power an elevating platform. Stand on the platform and place a time portal behind the node to raise it further. This allows summoning a reflector cube. Place this cube on the lip above the second receiver. Travel to the future. Retrieve the future reflector cube and bring it to the present using a time portal in the laser room. Position it to reflect the laser through the node into the second receiver. To reach the other side of the particle field without passing through it, use a portal on the other side 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. Move the reflector cube onto the switch to complete the chamber.