Krita is a professional free and open source painting program. It is made by artists that want to see affordable art tools for everyone. It can be used for concept art, texture and matte paintings, illustrations and comics.
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Simulation
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.