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A genre focused on the lives of teenagers and young adults during their (potentially metaphorical) journey into adulthood, where the characters typically overcome obstacles to learn lessons about being an adult as they figure out what's most important to them.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.