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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.

Featuring games with three-dimensional graphics, environments, and gameplay mechanics. Depth and perspective create immersive virtual worlds.

Presenting gameplay from the perspective of the player character's eyes, typically rendering a 3D environment. This view allows for immersive exploration and interaction, often used in shooter, adventure, and simulation games.

Science-fiction. Commonly including things like aliens, advanced technology, and settings of outer space or distant planets. 

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.