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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.

Programs that typically run in the graphics pipeline directly on the GPU to apply special effects to graphics

Products that involve or comprise source code, including programming games; does not refer to products with their own source code available, open source or not.