I don't think games are a good tool for educating adults about new concepts, they are time-consuming and distracting. You could use them to teach kids, but why would you want to teach kids about Bitcoin in the first place, it's not like they will be using it till they grow up.
Adults play games to relax and have fun, and educational games generally have poor gameplay, so I can't imagine such game being popular.
I think this depends on how the game was developed. Educating someone using a game does not necessarily mean a straight-up tutorial. The game developer can incorporate important facts into the storyline of the game.
For example, in an RPG game, a developer can make a quest about the importance of protecting passwords and private keys in cryptocurrency, or a Visual Novel with a good storyline will do. It all depends on how creative the game developer will be and how he can make learning crypto interesting while playing his game.