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A game in which the player is not constrained to achieving specific goals and has a large degree of freedom to explore, interact with, or modify the game environment 

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

Shambling undead humans who died after being infected by some sort of virus and are now "alive" again, commonly known for the desire to kill living human beings. Commonly paired with the (post-)apocalyptic genre.