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Games that try to simulate real-world activities (like driving vehicles or living the life of someone else) with as much realism as possible. Simulators generally require more study and orientation than arcade games, and the best simulators are also educational.

Games that defy the traditional approach to game design and offer unique, interesting and often strange experiences.

Games that typically contain a large world that you are free to explore in any order you like. Completing objects may open up new areas or change how previous areas functioned.

The larger universe outside of Earth's atmosphere. Sometimes really, really far outside of it.