You get... MOBILE PUNCHER

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You get this weapon from defeating Mobile Man ([link]). Megaman gains an extendable fist that can be fired off rapidly and in 8 directions. The limit of extension is when the fist hits an enemy/wall/ceiling/obstruction. (In-game, the player can just hold down the attack button to fire this continuously. Of course, weapon energy will be depleted faster this way.)
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Sprites used from Sprites' Inc
Concept from my evil mind...