For example, you can be active on the DLive platform. If you're in the gaming business, it's probably very easy for you to get a foothold there. Otherwise you are welcome to try Steemnova. This is a game like the browser game Ogame only linked to the BlockChain.
As of now, I think, https://steemmonsters.com/ is the most successful app, built on steem blockchain, where you can play games soon. Right now people are accumulating the cards and can play soon.