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Professor Portal Help
I need help to get this achievment....can anyone help me? D:
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which achievment is it?
Professor portal is the name i have to play the co-op calibration with someone who has never done it before ._.
did you do it cuz i will
norill 21. helmi, 2013 16.45 
i would also like to play co-op with someone to get this achievement
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Portal 2 > Yleiset keskustelut > Aiheen tiedot
Lähetetty: 15. marras, 2012 14.13
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