So, today I wanted to play some online matches in crysis 2 but I didnt come very far... I logged in as I normally would and then go intro online, just to get a message about my serial is incorrect >:( Why is this happening? My serial worked fine in the start but now it′s just invalid. I still have my game box laying around with the game and my serial so what do I do now?
Sorry for any grammar mistakes. English is not my native language.

Edit: Nevermind, had to type my serial in again for some odd reason and now it seems to work.

I got the same problem, do you know what it was, I bought crysis 2 so I got the correct serial, and it doesnt working, I have the message "serial is incorrect" same to you, i dont know what to do its damn wrong

Contact EA support/live chat.