freebtcminer is a great game allowing you to play as a miner digging deep into the eart to find precious metals and then exchange them for bitcoin, with a foundry that can be upgraded in which to store your bitcoin into and double within 21 hours.

pays out to faucetbox or paytoshi fully legitimate and paying game, loads of fun. 

https://www.freebtcminer.com/referrals/new/186

go check it out :)