I am in the process of adding custom maps for portal

I did not make these so all credit goes to the original owners.  Some are taken from www.portalmaps.net, other are taken from elsewhere

Anyway heres a few tipc you might need to use:

To play these maps:
Save each map to the c:\steam\[steamid]\portal\portal\maps folder
Unzip any that are zipped
Run portal
Enable the developers console. You can do so through settings -> keyboard -> advanced -> enable dev console.
Open the developers console by pressing ~ or ` (the key beside 1 and under escape)
Finally type "map" (without quotes) then the name of the map, and press enter. E.g: map prl_map1


Note: If you are having lighting issues, type "mat_fullbright 1" into the console and it should fix your problem. Just make sure to set it back to "mat_fullbright 0" when you're done.