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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 feature 3D art that has a low polygon count per model. Generally used as an artistic style.

For that old school look and feel.

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.