World 1-51: Bloons

Bloons
http://apps.facebook.com/mindjolt/games/bloons

I didn't actually beat this game on Kongregate, I found an app hosting it on Facebook and I beat it there. Bloons is actually a pretty addicting game, I've beat it a couple times now. The later versions are quite enhanced versions, but the original is where it all began. So while it's not perfect, it still earns a high rank for being original and fun, and starting a great new series of games.