What is known
A Black Ops III custom Zombies map in a browser, from the starting list of community links. Details are not verified yet.
Links
Deep dive in progress
This page is a short entry. The full write-up (original game, who built the port, how to play, creators and sources) comes next.
It is not confirmed whether it needs your own game files. Unofficial fan project: it can be removed without notice. Not legal advice. Never run a launcher or download from a page you do not trust.