*For anyone who hasn't played co-op yet:*

[Rock of Sham]

What's up guys? I'm guessing with the recent Holiday Sale, several people picked up Portal 2. Do any of you newcomers (who HAVE NOT played co-op yet) want to help me get the Professor Portal achievement? I will help with any achievements that you'd like help with. Thanks in advance! :)

[| \_/ ()]

I don't think anyone is gonna answer that. What I did to get this achievement is that I just scrooled down the community hub, clicked on users ,posted screenshots from the single player or not so big community chambers and viewed their game stats. If anyone hasn't got the ''high five'' achievement, he obviously hasn't played CO OP before. send him a friend request and just wait . there are many users, that haven't played CO OP so someone will add you soon. then you just ask him to play.

[Rock of Sham]

Thanks man, appreciate it. (This achievement is HARD!!)

[MR_R3TR0MAN]

please can you GUYS try mine and another from my collection http://steamcommunity.com/sharedfiles/filedetails/?id=118741921