Steempunknet came to mind regarding that. They are another one that runs on our blockchain.

Then you have stuff like Steemnova where they took an open source game and modified it somewhat to use some elements of the bloc chain such as account sign in. While also using it to give out some rewards. There members can also create bug reports in attempt to get reward or provide translates.

There are lots of games running around. Many of them might be more text based then anything else. Still interesting to see how people use things here. There even a fun little account that people call in to get a dice roll. @rollthedice