Portal 2 > Yleiset keskustelut > Aiheen tiedot
XchocomanX 15. marras, 2012 14.13
Professor Portal Help
I need help to get this achievment....can anyone help me? D:
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MineCraft lover 16. marras, 2012 7.46 
which achievment is it?
XchocomanX 16. marras, 2012 8.45 
Professor portal is the name i have to play the co-op calibration with someone who has never done it before ._.
xXJackPlaysXx 25. tammi, 2013 12.54 
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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