Part 30

Complete Part 30 of the Portal walkthrough, including the final confrontation with GLaDOS and the advanced challenge maps AC13, AC14, and AC15.

Advanced Challenge Maps:

Advanced Test Chamber 13 (AC13)

1. Run forward and stand on the button.
2. Look through the grate and out the door. Shoot a portal above the piston with the button on it, and the other portal elsewhere. Fall through.
3. Shoot one portal at the orange light above the energy ball receptacle and the other at the mark where the energy ball is hitting the wall.
4. Shoot a portal at the thin white strip above the moving scaffold and the other at the wall near you. When the scaffold is underneath, fall through.
5. Grab the box and wait for the scaffold to move to the side closest to the piston you were on.
6. Look in the water to find a small black patch of ground. With the box, jump there.
7. Shoot a portal at the wall directly in front of you and the other high up on the wall nearest the starting piston.
8. Place the box on the button, then jump to the lower piston.
9. From here, shoot a portal through the door to the right of the energy ball dispenser.
10. Shoot the other portal at the wall and jump through. Head into the elevator.

Advanced Test Chamber 14 (AC14)

1. Run forward and turn left at the intersection. Run to the top of the stairs, then turn and face the large dark-tiled platform in the corner.
2. Shoot a portal near the base of the platform, then turn and run back to the edge near the energy ball receptacle.
3. Shoot a portal at the ground below the ledge, then jump down and go through. While in the air, aim your analog stick in the direction of the platform.
4. Grab the box on top, then run back down the stairs and past the piston. Place the box on the button.
5. Continue through the door, then follow the corridor until you reach a room with water in the middle.
6. Shoot one portal at the wall across from the door you just came out of (directly across from it) and the other on the wall on the other side of the water (not inside the far doorway).
7. Run through and turn to face the doorway near you. Shoot the portal near you (the one you just exited) where the energy ball is hitting the wall.
8. When the ball goes towards the portal, follow it through, then dodge out of the way when it bounces back.
9. After it bounces back, run through the doorway, then follow the corridor back to the energy ball receptacle.
10. Place a portal (the one not in front of the energy ball dispenser) above the receptacle to complete the circuit. Ride the piston up and head into the chamberlock.

Advanced Test Chamber 15 (AC15)

1. Run forward and through the corridor. Run to the small patch of white ground.
2. Shoot one portal directly above you and the other at your feet.
3. While falling, aim at the pushed-out concrete block near the ceiling with the portal that was on the ceiling (not the one on the ground). You will be pushed out and fly over the partition.
4. Go through the door. In the next room, you will find three energy grids. If you stand in the middle energy grid facing the dividing wall, they...