....famous last words....
Here is the map, It probably wont even make it into the final 19 maps (put it in C:\Program Files\Steam\SteamApps*username*\portal\portal\maps)
dload.php?action=filefile_id=20
Please note one thing you should know - you can place portals on all textures, please don't I've followed the same conventions as the official game, metal can't have portals whilst concrete can.
If you play it, please leave feedback, any feedback is good feedback
Edit: This isn't going to be in Portal: Test Subject #13
Edit: Updated the file, now the metal walls are unportalable and ive made a few tweaks here and there
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