Basically the world consists of blocks. The grafics are pretty basic but the game can get quite complicated. The blocks are of different materials (wood gold iron coal etc...). With the different kind of materials you can build different things. You can play single mode or online in multiplayer.
I started playing multiplayer a couple of weeks ago with steem.craft (or skyroad) which is a german server. @Immanuel94 ask me if I would write a blog in english for the site so I came up with this:
https://steemit.com/minecraft/@pompe72/fishing-for-steem-on-steem-craft
Always keep the dust threshold in mind, everything below 0,02$ is going to be deleted. @immanuel94 already had problems with that at the game. Because sometimes 0,02$ rewards are also deleted. If you want to avoid this, use @dustsweeper. ;) Very important, sometimes.
Yes, I sent some steem to @dustsweeper a while back. They say that they will tell you when the balance is low. I haven't seen any message from them yet but maybe I shouls send another steem just to make sure.