A Rocky Wrench tossing a Wrench
Rocky Wrenches are a type of Monty Mole that work on Airships (possibly as mechanics). Whenever Mario, Luigi or Yoshi are storming the Airships, they periodically pop their heads out of the holes and toss one of their working tools (the wrenches) at them. They can be unpredictable at times but defeating them is generally easy as any attack can beat them. They can also be stomped on as long as they're sticking their head out of their hole. In their debut Super Mario Bros. 3, Rocky Wrenches originally had shells and were described as a turtle-mole hybrid however later games have dropped this feature making them merely moles.
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Rocky Wrenches are seen in New Super Mario Bros. Wii. They are found on most Airship levels where they toss wrenches at Mario and his friends. Their aiming is usually precise so be careful, any attack can defeat a Rocky Wrench as long as they're above the ground. They can also be frozen with the Ice Flower, but they cannot be picked up, they can still be ground pounded, however.
Rocky Wrenches also appear in New Super Mario Bros. U once again on the Airships. Their behavior is identical to how it was previously, once again any attack can beat them. Rocky Wrenches are among the few enemies from New Super Mario Bros. U to not reappear in New Super Luigi U.