It's the sense of creativity, freedom, satisfaction, and progression that the game gives you. It's not for everyone. But for people like me, there's nothing more satisfying and exciting than spending an hour traversing the labyrinthine inner workings of a mountain cave, just to find a group of diamonds at the very bottom. Then going back to the house that I've built and building improvements for it.
That's how I play it, in survival. But you can just play in creative mode and build giant megaman and cock 'n' balls statues if you like.
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