You're headed in the right direction when you realize the customer viewpoint is more important than the company viewpoint. It's more productive to learn from your customers instead of about them.

I'm creating the kind of games that I like right now. I'm not being held back by technology.

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.

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.

In marketing I've seen only one strategy that can't miss - and that is to market to your best customers first, your best prospects second and the rest of the world last.

It may be a lot more personally rewarding to focus on the marvelous new equipment, but the focus should be on customers - attracting them, courting them, rewarding them, understanding them and binding them to you.