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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.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

A perspective where the camera is placed directly above the player. Common in 2D games, but can also be used in 3D games.