The Rock Monsters have been tunneling to the surface of Venture so they can take over the world after mysterious earthquakes from deep in Venture, and the Future Miners plan to stop them.
They are shown to have primitive technology, like catapults. The Rock Monsters eat crystals, which give them power. If a rock monster eats a different colored crystal to what it is it will fart and throw up. If they consume dynamite (and it goes off in the stomach) they will solidify.
In Part 2, a new type of large Rock Monster are shown. They appear to be large versions of the small monsters. The large version of Sulfur is called Geo, while the large version of Meltrocks is Tremorox. As well as those, another rock monster called the Rock Rage, the biggest Rock Monster. He is now awoken from his sleep.
Rock Rocket is a game on Venture.com. In it the player controls a Rock Monster and lets him eat crystals.
- Hand hands and Rock monsters share territory near Venture's core.