A group called [i]We Create Stuff[/i] developed an Adobe Flash game called, appropriately, "Portal: The Flash Version" where you can play a 2-D version of Portal. It's amazing, and apparently was created just from the ideas in Valve's [i]Portal[/i] before the actual game was released.

I bought The Orange Box on the strength of the trailer for Portal, and the game was actually [i]better[/i] than the trailer even though there was at least one segment in the trailer that was not present in the game. (Compressing ceiling next to a fire pit.)

Well, anyway, WCS then went on to release an add-on for Valve's Portal which basically took the traps in their 2D Flash version plus new hazards and converted it to 3D. These new hazards - many of which have no equivalent in the original Portal game from Valve - include:

* Red walls/floors that will vaporize you if you walk or fall through them
* Blue walls/floors that are basically transparent and non-passable except, unlike a glass partition, you can shoot a portal through them
* Multi-switch areas where you can see several areas and you have to figure out how to get to them and drag cubes around to trip the switches
* Special endgame completely different from the original Portal, but similar

WCS's "Portal: The Flash Version Map Pack for Portal" is well done enough to represent a full replacement map for the original game. Plus, they're both free but you need Valve's [i]Portal[/i] to play the Map Pack.

Portal: The Flash Version - [url]http://portal.wecreatestuff.com/portal.php[/url]
Portal: The Flash Version Map Pack for [i]Portal[/i] - [url]http://portalmaps.wecreatestuff.com[/url]