Hammer Bros. first appeared in Super Mario Bros. and have gone on to appear frequently throughout the Mario series. They primarily act as enemies that throw hammers at the player while jumping around surrounding platforms. They appear as enemies in the Subspace Emissary in Brawl and in Smash Run for Super Smash Bros. for Nintendo 3DS, and in both Brawl and SSB4 as an Assist Trophy. They have similar attack patterns as they use in Super Mario Bros. with a reliance on throwing hammers and jumping. Their design is based on the Hammer Bros.' appearance in more recent games.
Hammer Bros. appear in Brawl as an Assist Trophy. They are invulnerable and attack by throwing hammers at opponents, and occasionally jump.
They also appear as enemies in Subspace Emissary with the same behavior, but this version can be attacked and defeated.
Hammer Bros. reprise their Brawl role as Assist Trophies and enemies, this time in Smash Run. Their behavior is unchanged, but unlike in Brawl, their Assist Trophy version can be attacked and defeated. If defeated, they act as they did in the original Super Mario Bros., falling through the stage while upside down.
Hammer Bros. once again reprise their Brawl and Smash 4 roles as Assist Trophies. Their behavior appears to be unchanged from Smash 4. Training Mode describes their Assist Trophy: Throws hammers. Lots and lots of hammers. Hammer Bro is also a Spirit for the game's Spirit mode.
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