You like to play AND to earn? Then RollerCoin is just perfect for you! RollerCoin is a online Bitcoin mining simulator. You gain hash power by playing games. Make sure your mining rig has enough electricity. The game is free to join. You can buy but don’t have to buy a miner. You can make money just by playing games. Minimum payout is 10000 Satoshi which is roughly $4.79. They also have a referral program to boost your earnings. You gain 25% from your referrals profit and 15% from their in game purchases. Overall, a very good program if you like to play small games.