From the Super Mario Wiki
The mission occurs in the cells of Twinsy Tropics Dungeon. Mario and co. must retrieve their attacks and Command Blocks, which were stolen by Hammer Bros. Prior to retrieving any Command Blocks with damaging attacks, Mario and co. can only damage the Hammer Bros by counterattacking. Regardless of which Hammer Bros are fought, they always retrieve the same action commands in the same order: Flee, then Rocket Blast and Drill Shell, then Hammer, then Trio Kite, then everything else. Once everything is retrieved, the mission is completed.
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