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32 pixels by 32 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 32x32, they are designed to work in a graphical setting where objects are around that size.

Graphics for creating characters

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.