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Taking place after a huge catastrophe (eg. man made or natural disaster). See also the more political theme dystopian.

TPS or Third Person Shooters are shooter games that have an over the shoulder or behind and above view instead of an eye to eye view.

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.