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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.

You are looking through the eyes of the main character.

Horror that challenges the brain and messes with the psyche, leading to a mind-racking experience. 

Games which have short playtimes and can usually be completed in one sitting.