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The Orange Box: Portal Hints
Bonus Maps: Advanced Chambers
After you "unlock" advanced mode by playing all the way through the game once, you can go to the bonus maps option on the game's main menu and choose to replay Chambers 13 thru 18 in advanced mode.
The chambers will be mostly the same as in a regular playthru, but with a few new twists to make things harder, such as fewer storage cubes, more toxic floors, and more metal-covered surfaces. Still, you're not under any kind of time, step, or portal restriction, so the advanced versions of chambers are really much easier to master than most of the challenge versions.
