Piko Piko hammer (InstanceTopic, 9)

From Compile Worlds

A Piko Piko hammer is a type of hammer with a very large head, often as big as a person (which is, oddly, the opposite of what might be implied by the word "pico", i.e. extremely small). They are capable of delivering significant damage to whatever they hit, though are somehow quite easy to wield. They also often appear and disappear from portable holes.