There is a new app that is available on the google play store (not sure about it's availability for Iphone users) it's rather comically called oh crop, it's really addictive and is quite difficult to begin with.

The premise of the game is to last as long as you can and get into and stay in the top 10 players ranking for as long as the tournament lasts (7 days), the thing that makes it worthwhile putting time into though is the fact that as long as you manage to get into the top 10 and stay there you can stand to earn mBTC.

Last week I got to 7th place and got paid 17.5mBTC it does take up to 5 days to get paid though but it is well worth the wait in my opinion.