Portal 2 > Generelle diskusjoner > Emnedetaljer
XchocomanX 15. nov, 2012 @ 2:13pm
Professor Portal Help
I need help to get this achievment....can anyone help me? D:
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MineCraft lover 16. nov, 2012 @ 7:46am 
which achievment is it?
XchocomanX 16. nov, 2012 @ 8:45am 
Professor portal is the name i have to play the co-op calibration with someone who has never done it before ._.
xXJackPlaysXx 25. jan, 2013 @ 12:54pm 
did you do it cuz i will
norill 21. feb, 2013 @ 4:45pm 
i would also like to play co-op with someone to get this achievement
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