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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 where you discover new locations by traveling around in the game's environment

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

Unity is a game engine for 2D, 3D, AR and more