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Portal 2 map with L4D2 content

I would like to know, if anyone knows, how to import L4D2 stuff and make it usable on hammer for a portal 2 map. I would like to use the weather effect from the map hard rain, and make it playable on my custom map of Portal 2. Is it really hard to do ? Thx for your help.

Maybe it's not hard but I think you shouldn't do that because it's content from another game and you are not the owner of copyright for that stuff.

Test Chamber 74:
(percentage calculation sphere self-test failed!)
108.1% done, -8.1% remaining...
Released here!

All maps for Portal (1/2) worth playing are mirrored here.