This exists and is called huntercoin. The hard part for the human mining is coming up with a game that bots are worse at than humans, so it is still under devel

This exists and is called huntercoin. The hard part for the human mining is coming up with a game that bots are worse at than humans, so it is still under development: http://huntercoin.org/ http://huntercoin.org/ Soon (next month or so) the same team are releasing a multi-game coin as well: https://chimaera.io/ https://chimaera.io/