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Games which seek to lead the player on a journey through an uncertain and challenging world.

When jumping over obstacles is one of the main actions, challenges, or mechanics of the game.

Games that challenge the player with critical thinking to solve levels. 

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.