From the Super Mario Wiki
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At first, it is invisible. If Wario comes closer, it appears with a cloud of smoke, but if Wario comes too close to them, it vanishes again with more smoke. These enemies throw bombs to attack Wario - up to five can be on the field at a time before the Peek-a-boom ceases fire. Sometimes, Wario needs these bombs to solve puzzles, which let him get to treasures. If Wario uses an Earthshake Punch when he is close to a Peek-a-boom, he can pick it up and shake it.
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