"Caverns of Zeux" is quite possibly the first game created for megazeux. If you download megazeux, you get this game as well (unless you got megazeux from someone that forgot to add the .mzx files to the zipfile). It is about someone called "Vince" (from Labyrinth of Zeux, another game by Greg Janson) doing stuff in a very complex VR world (he doesn't even know it's VR).