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FIRST, NOTE! I DID NOT MAKE THIS TUTORIAL (original: http://www.primotechnology.com/2007/10/17/half-life-2-portal/)
First off, backup up your entire Portal directory in a safe place. It’s the folder marked “portal” in ..\Steam\steamapps\(your_steam_id)\. We, nor Valve, take any responsibility in the unlikely event of you hosing your game files. Worse comes to worse though, you could always just redownload from STEAM.
Next, download and install, if you haven’t already, GCFScape. This handy program will allow you to access the cached game files for any Source-powered game, in addition to several other Steam games you may have downloaded. (link: http://nemesis.thewavelength.net/index.php?p=26)
Once that’s done, browse to the directory ..\Steam\steamapps\. There, you’ll see all the available GCF archives. We’ll start with Half-Life 2.
Open the GCF marked “half-life 2 content.gcf” You’ll see a directory tree in the left pane. Click the box to the left of the folder marked “hl2″ to see the directory listing contained within it. Then, right-click “maps,” select ‘Extract’ and extract the entire folder into the directory \Steam\steamapps\(your_steam_id)\portal\portal. This will merge it with the existing Portal map folder.
Do the same with the ’scenes’ folder
Fire up Steam and run Portal. When it’s done doing its thing, open up the developer console with ‘~’ (you may need to enable it under your keyboard options).
At the console, type “maps” to list all the available maps. Now that you’ve imported the Half-Life 2 maps, this will be a fairly lengthy list and some of the names, like citadel and canals, should seem familiar.
Type “map” and then the map name to open that map. For instance, “map d1_canals_01″
When the map is done loading, pull up the console again and enable cheats by entering “sv_cheats 1″
To give yourself all weapons, including the portal gun, enter “impulse 101″
Depending on how far you got in Portal, you may need to upgrade the portal gun to fire both portals. Enter “upgrade_portalgun” to do so
Go lay waste to some alien scum with the power of portals!
"my Console says that it does not have these maps i checked they are in right folder someone please help me (don't try ,i deleted and extracted 100 times)"
Did you place it in portal/portal instead of just /portal. That is what I did wrong and repeated it a ton of times before realizing it.
Any way. This mod as a lot of bugs but never the less stays fun. (the fact that their bullets don't work increased the fun for me. :P ) Also no character sounds, a lot of the maps don't work, and no car.
It will take some trail and error to find what works but as long as you are not one of those freaks who cant have fun unless it works 100% then this is a fun mod to try.