Builder Mario is the form Mario, Luigi, Toad or Toadette take in Super Mario Maker 2 after collecting a Super Hammer, a power-up found exclusively in the Super Mario 3D World style. It adds a tool belt and a hardhat, and, in Mario and Luigi's case, changes their attire to yellow shirts and colored overalls. It grants Mario and co. the ability to swing a large hammer to slam the environment and enemies alike. Unlike Hammer Mario, where the hammers are arched projectiles, Builder Mario uses them as a melee weapon, similar to the hammer attacks in the Paper Mario series and the Mario & Luigi series. Builder Mario can also create a maximum of five Builder Boxes at a time to be used as platforms.
Although it appears as an ability-granting form in Super Mario Maker 2, Builder Mario first appears in Super Mario Maker most prominently in the game's artwork and promotional material. In-game, Builder Mario is one of the many unlockable Mystery Mushroom costumes, unlocked after clearing Gnat Attack for the first time. Upon transforming into Builder Mario, the title shout before the title screen can be heard; if the player clears the course as Builder Mario, the music heard when starting up the game plays. If the player loses a life as Builder Mario, the Game Over theme from Gnat Attack plays. Builder Mario raises his hammer for his pose when the player presses .
In Super Mario Odyssey, a cap and outfit based on Builder Mario's attire (named the Builder Helmet and the Builder Outfit respectively) can be purchased from the Crazy Cap store in the Metro Kingdom using regional coins.
Using the Dash button will make Mario execute a melee attack with his hammer, having a range of about 1 block in front of him and 2 blocks high. This attack is able to destroy Hard Blocks and Thwomps, and can even defeat Boos and Peepas; 7 hits with this attack will defeat Meowser, compared to 20 with Fire Mario's fireballs and Cat Mario's scratch attack. However, the attack is ineffective against Big Ant Troopers. If the attack is too close to an unbreakable object, such as ground, Mario will bounce back once the attack hits it.
When the player holds up, Mario will appear to hold his breath, signalling that he is now able to create a Builder Box. Using the Dash button while holding up will create a Builder Box. Up to 5 Builder Boxes can be made at a time, after which the boxes will disappear as new boxes are created. Builder Boxes are similar to Crates, but they have the player character's emblem on it.
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