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The Orange Box: Portal Hints
Bonus Maps: Challenge Maps
After you "unlock" test chambers 13 thru 18 by getting through them on a normal playthru, you can go to the bonus maps option on the game's main menu and choose to replay each chamber while under a challenging new restriction. You get to choose your restriction, and it can be least portals, least steps, or least time.
Below, I provide hints on the best strategies I know of for getting past each of the eighteen challenge maps with good scores. I don't list my best scores on "least steps" and "least time" challenges because I didn't bother to fully optimize them, but you can do so with the tips given in the above question (plus a *lot* of patience).
