Rollercoin is a "Bitcoin Mining Simulator". As the description implies no actual mining is involved, cloud or otherwise instead you play games to earn imaginary hashrate and "mine" Crypto.

I registered sometime during January, I was kind of skeptical at first but I was willing to give it a try. The amount of bitcoin I earned at the beginning was pitiful but the hashrate started adding up and I started earning more and more. I had lots of free time on my hand and some of the games were fun enough. The site gives you the option of "mining" Bitcoin, Ethereum and Dogecoin. Due to the high fees of Bitcoin and Ethereum I decided to mine Doge. At the time it was priced at just below a cent and I made something like ~30 Dogecoin a day. I had accumulated 400 Doge by the time its price exploded and decided to withdraw it to my wallet while it was mooning, within a relatively short time the requested coins arrived in my wallet. With the arrival of those funds my doubts were alleviated and I decided to keep on using the site. I've requested two withdrawals since then and both of those also arrived in a timely manner. In total I've earned ~1500 Dogecoin plus a tiny bit of Ethereum and Bitcoin since starting which adds up to just above $80 in value. 

Overall my feelings on the site are positive. The payout is decent and it has games which are enjoyable enough. I don't really have anything negative to say about the game, it's a good way to use your time when you're listening to a podcast or something of that kind.