Well, this is kind of a noob problem, and it's probably simple to solve, but I just can't figure this out. So, my problem is: How can I start HL2DM in offline mode? I've played it on the internet a few times, but now we want to try it out with my buddy on LAN, and I just can't start it without Steam telling me, that I can't run it in offline mode.
Thanks for your help.