I clicked the windows button to minimize portal 2 and now i can't open it!!!! I do not want to exit out of it because i didn't save it and i got past 3 chapters the last time i saved it. Please help me....
Sorry, same thing happens with fallout games. You simply cant reopen them.
Portal 2 should auto save however, you should only have to redo the previous test chamber.
The only thing is i got to chapter 6 and my last save was at chapter 3... so i have to do multiple chambers as well as escape which i have a feeling is gonna be another hour and 30 minutes