JBMod is the predecessor of Garry's Mod, it is still not sure if it's true or not.

(It is the predecessor! The map files are dated before GMod's first release! Fuck GMod)

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.