The weapon you get when you beat Heat Man in Mega Man 2. You can charge it up by holding down the Fire button, and then release for maximum effect.

Atomic Fire was eventually lost to the ages, but the specialized game mechanic of charging up your weapons would soon take hold... after it slept through Mega Man 3, of course.

It is a notable weapon in the fact that Karma Hunter has no idea how to charge it.

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