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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.

A game where you have to start over from the beginning when you die. Often goes together with procedural generation, so it doesn't get boring!

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