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

Games that can be played alone

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

Utilized combat systems where characters or teams take turns making their next move. Turns often have no time limit, allowing for a greater opportunity to think about strategy. The opposite of real-time combat.