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heads up, learn a basic workflow to import content into blender, assemble and export to unity. It's free and it'll take you a day or so to learn, but it'll literally save you hours each time you need to work with new content.

All the scenes you see were assembled in Assetforge in a few hours.  I put together 4 separate environments.

How can you create such a game

if that's a real question, the answer is that you will need to duckduckgo some tutorials.  Unity has a large community.  Also, there are premade game engines that do most of the work for you like uMMORPG