Miner Dig Deep
Bought this game off Xbox Live for 200 points and its really fun, especially for the price. Its one of those Community games and your a miner and you basically dig a HUGE mine sort of like Dig Dug only without monsters killing you. Challenges include dodge rocks, collecting gems before your lantern runs out, and finding blue prints so that you can get past certain parts. It apparently goes on for quite awhile as I have been paying it off and on for a few days. As you gather gems you can sell them at the store. The money can be used to upgrade to a longer lasting lantern, faster mining pick, power drill, bigger bag, etc.
Very interesting game for the price though, I would recommend trying the demo at least.