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I like the list. I'm thinking/hoping that sandbox games with generated content will becomes a larger part of the core game market.

Mostly, we see success in the indie 2D world:

Certainly 3D games are quite exciting in this space, too, but the 2D games seem to have a lot more traction with the big exception of minecraft.

I suspect it's simply easier to make an engaging sandbox when you don't have to worry about complexities in art assets that a 3D game requires.