I'm feeling a bit nostalgic today. I never had an Atari 2600, but I used to play a lot of it's games on my PC.
There are a lot of fun 2600 games, like Pitfall, River Raid, Tennis, Space Invaders... But my favorite is Moon Patrol.
Really, this game is so addicting. I've spend quite a lot of afternoons trying to beat it back in the days.
What about you?