Hey I have a question about the single player mode on the PC version of Call of Duty 4 modern warfare that I can't find an answer to anywhere else on the internet. My dad's birthday is coming up and I think this would be the perfect gift because he likes playing shooters on his PC but he doesn't have a highspeed connection,does COD4 require one to play single player? I have googled it but some sites say it does and some sites say it doesn't,does anyone here know for sure?

Thanks for your help.