More fun yes, but to add a whole new dimention would mean writing new functions, grabbing new textures (which could be illegal under current licences), and doing heavy modification. The team is only one man, and remember that we don't even have access to the source code, just the binary.
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When Will there be a nether?
It's not practical to add nether stuff. You can use a nether reactor though.
Why is it not practical, I thought the goal of this project was to make MC:PI more fun, including survival also involves a way to beat the game
More fun yes, but to add a whole new dimention would mean writing new functions, grabbing new textures (which could be illegal under current licences), and doing heavy modification. The team is only one man, and remember that we don't even have access to the source code, just the binary.