Portal/Chamber 14

Chamber 14 involves more momentum puzzles, as well as the puzzle of how to bring an energy pellet a long distance, around several corners.

The first challenge is to get hold of a cube to put on a button so that a door can be opened. This may sound straightforward, but the cube is on top of an unclimbable raised platform.

Getting the cube
Turn to the left and walk forward. As you do so, stairs will rise up, allowing you to simply walk to the pellet receiver. The cube is on your left. This is a momentum puzzle, as indicated by the fact that the stairs to the pellet receiver area retract once you're up there. Place the first portal high on the wall to the right of the raised area. Place another portal at the bottom of the pit formed when the stairs retracted, and fall into it. You should fly onto the raised platform.

Once you're on top of the raised area, you can pick up the cube and take it down to the button. As soon as the cube is off the raised platform, the stairs will permanently rise up again. Put the cube on the button and open the door.

Getting the pellet
The door leads around a corridor to a room filled with sludge and some platforms which periodically go up and down into the sludge. On the other side of the room is a small antechamber with a pellet launcher; either use the platforms or a portal to get to the room.

Once in the room, place a blue portal over the scorch mark on the wall, letting the pellet through. Now jump across the platforms and continue to the pellet receiver.

At the pellet receiver, simply place an orange portal on the red spot above it – letting a pellet into it – and ride the lift below to the chamberlock.

"Very, very good. A complimentary victory lift has been activated in the main chamber."

- GLaDOS

Advanced
You can't ninja to the exit, since the floor was made portal-proof. The box is also harder to reach and two moving platforms are removed. To reach the cube, you need to shoot a portal down the staircase and one next to the box section. Jump down, and you should land on the box. Place it on the button.

To reach the pellet, you need to portal across the water area. Place a blue portal on the scorch mark, and a gold portal back on the other side. Walk back to the main area, and place a gold portal above the pellet receiver. The exit is now open.

Portals
Two portals are required:
 * 1) Blue: In front of the lift, as close as possible.
 * 2) Gold: At the top of the staircase, fire a portal the floor once the stairs lower.  Jump in, and control your flight to land on the raised lift.

Awards at 6, 4, and 2.

Although this path can be used in the main game, it is not viable if you keep going up and down the stairs. Once they raise for the second time, you cannot attempt the path again without loading an earlier saved game.

Steps
An 11 step solution places two portals at the entrance, above each other. Jump through the bottom, and try moving the second portal just in front of the lift.

Awards at 55, 20, 10.

Time
Staircasing gets you within 20 seconds, but going for least steps is possible within 10.

Awards at 50, 20, 10.