Rock monsters are an often-overlooked Type, though there were many released in The Lost Millennium series. Usually, Rock monsters belong to the Earth Attribute and possess high DEF and defense-related effects.

Archetypes include Monk, Hex-Sealed Fusions, and Sphinx cards.

Some of the more notable cards include: "Exxod, Master of The Guard", "Gigantes", "Legendary Jujitsu Master", "Mine Golem", "Moai Interceptor Cannons", "Muka Muka", "Neo-Spacian Grand Mole", "Sand Moth", "Stone Statue of the Aztecs", and Castle Gate"

Four Field Spell Cards exist that work particularly well with Rock monsters. "Wasteland" increases the ATK and DEF of Rock monsters by 200. "Canyon" inflicts double damage to anyone attacking a Defense Position Rock Monster with a weaker monster, "Gaia Power" increases the ATK of Earth monsters by 500 points, though it weakens their DEF, an important part of Rock Monsters' strategy, and "Acidic Downpour" which is the reverse of Gaia Power, decreasing their ATK by 500 but gain 400 DEF. Rock-Type monsters are weak against the card, "Breath of Light".

They also have their own Structure Deck, Structure Deck 7: Invincible Fortress.

Support Cards
* Canyon
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