Last night, storms knocked out our internet and cable, but luckily spared our power. With no internet, I decided to play Tombraider, which I got from Steam. Imagine my suprise when I discovered that I couldn't play a non-online game without internet! Kidd and I also thought of playing L4D with just the 2 of us (LAN style), but alas, can't do that either.

Is there any way to play non-online Steam games with no internet?