I've been thinking about this for a while, and basically you have to start on an account that hasn't played JToH, and get to a certain ring/zone. If you don't want to create new accounts, you could just beat the required amount of towers in all the past rings/zones. It could work and get more full-game runs on the leaderboards. Thoughts?

Seems like a cool idea, though it might have a couple flaws.