From the Super Mario Wiki
Hammer Mario is a form of Mario or Luigi in Super Mario Bros. 3 when he obtains a Hammer Suit. When he has this form, he resembles Hammer Bros. and is able to throw hammers. He is also immune to fireballs when ducking and can defeat most enemies, even Bowser. He gains an infinite supply of hammers and throw his hammers at an arc just like Hammer Bros.. While the suit appears to thoroughly protect Mario or Luigi, it does not defend against the simplest of attacks and will be lost in one hit. Hammer Mario cannot Slope Slide.
This form is not to be confused with Mario or Luigi wielding a hammer, with the difference being the infinite supplies of hammers and the black shell. Hammer Mario can defeat most enemies, even Boos, Dry Bones, Stretches, and Thwomps.
Names in Other Languages
- Pushing forward on the control pad while throwing a hammer changes its trajectory.
- If Mario or Luigi beats a Koopaling while in this state, the ruler of the world will say "Hey, you! How about lending me your clothes? No dice?! What a drag."
- When Hammer Mario ducks, he resembles a Buster Beetle.
- The Boomerang Suit from Super Mario 3D Land is similar to this suit, only that suit is based on a Boomerang Bro.