I think DOOM had just the right mix of elements that keep people coming back to it: great monsters, excellent weapons with great balance, a spooky environment and extreme speed.

I think the reason that I like so many different games is because I like the way my brain works when I'm playing games. It's more fun.

The thought processes that go through my head when I'm playing a game compared to the thought processes in real life are very, very different. And they're more interesting to me than what you think about when you're doing the dishes, cleaning the yard, watching TV, driving or watching a movie.

You might not think that programmers are artists, but programming is an extremely creative profession. Its logic-based creativity.