The mini-game's objective is to follow the pattern.
The player has five lives while Hammer Bro has three. Hammer Bro hits four colored drums in a random order with his hammers, then releases a music note to attack the player. Using the stylus, the player has to play the same drums in order before the music note hits them. If the player does not hit the same combination in time, they will lose a life. If the player manages to play them on time, a charged music note is released and sent to Hammer Bro, hurting him and causing him to lose a life. After three hits, the Hammer Bro vibrates slightly from the shock of the last strike, and collapses.
When replaying the boss minigame in Free Play, the player can win a reward based on how many times they have beaten this boss.
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