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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.

Godot Engine - The free and open source 2D and 3D game engine

Virtual Reality, or VR, are projects that use special headsets to provide a more immersive 3d space.