All the ideas are good, but I just want everyone to be able to enter without having to have a particular game.

I'll agree that the L4D prize draw never worked quite as planned, but remember that was a completely random draw. Everyone just wrote their names down, and one was randomly chosen. What I want to do here is have a skill based competition that everyone has a similar chance at winning (which is why I said forum based). But, as you said DK, perhaps those who spend more time have a greater chance.