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and a few months ago they made it really easy to make your own maps and submit it to the community. there are some really clever maps out there. 1 day i might make my own map.

I bought portal 2 on steam (bundled with portal 1 for myself) for my roommate after he almost finished portal 1. he likes it. i got all the co-op achievements i was missing b/c i bought it for him lol. (stuff like complete the intro with some1 who has never played before. the other co-op achievements i got with strangers) too bad i haven't gotten my mic fixed yet. it isn't as fun without speaking.

I should pick up a copy of portal 2 sometime soon then lol

I just checked. They are cross platform

I have no idea. I guess if sony and steam used the same server for cross play it should be possible.