This is a tutorial showing you how to get the achievement Pit Boss for 30G.

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1) Load up Chapter 9 Chamber 17.

2) Enter the chamber.

3) When you enter the chamber, Wheatley tricks you.

4) You will be launched by a launch pad.

5) When you land, you will be surrounded by traps.

6) Shoot a portal on the wall up, ahead past him.

7) When the trap begins place the other portal at your feet.

8) You will be on a walkway.

9) Jump off of the walkway and kill yourself.

10) The achievement will pop up and earn you 30G.

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Here is a video tutorial: