From the article: Portal 2 Cheats - PC
So you've been searching for Portal 2 cheats, and you've now seen what is available. On this page you'll find user submitted hints and tips for Portal 2 on the PC. Hints and tips can be extremely useful, even if there are no 'real cheat codes' for the game. Read through the hints and tips for Portal 2, and feel free to add your own.
Cheats
- To turn on cheats go into options and turn on developers console ten press the ~ key then type sv_cheats 1. That's how you do it! It's that ez! :D
- —Guest Me
Pit boss
- *SPOILER WARNING* When you are being escorted by the excursion funnel near the end of the game, you will find that you have to escape many spiky platforms that Wheatley will use to kill you. Escape from these using the conversion gel and Wheatley will appear desperate and ask you to come back. Do as he says and he will then ask you to jump in the pit. Jump in the pit and you will get this achievement.
- —Guest Jake Sanchard
Portal 2 Alternate Opening Scene
- Complete Portal 2 to unlock a new opening scene at the beginning of the game.
- —xbsjason