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Games that challenge the player with critical thinking to solve levels. 

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 where you have to manage resources in order to complete objectives. 

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