Watch this series explaining minecraft, it will probably mean you wont need to play it, but it will give you a good insight into a game though made of cubes, it has many more possibilitys than most normal games, because its completely formed from a kind of unitary particles or atoms, in minecrafts case a 1m cube of various types, and because of this you can do all sorts of things in this game that normally wouldnt be possible, perhaps in the future the shell like surface nature of models in gaming will we moved over to a solids or atom style basis.