RollerCoin is a free Bitcoin simulator where you compete against your friends to earn BTC.
This bitcoin game follows the concept of bitcoin mining but instead of completing sophisticated computations the site allows you to complete tasks, undertake missions, test your skills and play games to earn some bitcoin.
The game offers you a unique experience where you may end up dealing with some realistic tasks such as electricity bills, data centre repair, rent, and air conditioning costs.
To increase your mining power you can play side missions, complete mini-tasks, upgrade your data centre, and more.
RollerCoin offers a block reward every five minutes which is shared by all the participants depending on their mining power. The site was launched in 2018 and has so far paid out 1.65 BTC.