It's called the Diesel Pulling Challenge, and within the first three weeks of being available for Android and two weeks being available for iPhone users, it reached more than 300,000 downloads. Some questions I have for those that have downloaded the app: Is it or is it not the most addicting thing on earth?! I just got started in the Work Stock Class... Any tips or secrets you guys can share?... I'll let you know how I'm doing in the next couple of days.