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VGPolyglot said:
How does Nintendo manage to compress their games like that? Why can't PS4 or XBO games do that? I am constantly having to delete games to have enough space.


It's not only about compression. It all starts with thorough art direction and a firm desire to keep an orderly project. 

If you know exactly what you want on screen, as to know what things need textures and which can do with just materials, and which rigs and animations need to be more or less complex, and you keep a close watch on which files get included in the builds of the game, so you can weed out content that has been replaced with newer versions, you will be a lot better off.

It goes a much much further than that though, in both regards. Books could and probably have been written on this topic. :)