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Attack Pieces are special puzzle piece items that were introduced in Mario & Luigi: Bowser's Inside Story and reappear in Mario & Luigi: Dream Team. They are usually found in singular areas, and collecting ten of them in one area will grant Mario and Luigi with a powerful Special Attack in Bowser's Inside Story, Bros. Attack (in the Real World) and Luiginary Attack (in the Dream World) in Dream Team.
Most Attack Pieces can be found in and collected by striking blocks that resemble them, though others can be obtained by different methods (ex. from NPCs after completing certain objectives).
Mario & Luigi: Bowser's Inside Story
Attack Pieces make their debut in Mario & Luigi: Bowser's Inside Story, where they grant Mario and Luigi with a Special Attack once all ten are collected. They are first found in the Trash Pit.
Mario & Luigi: Dream Team
Attack Pieces make a return in Mario & Luigi: Dream Team, but this time, they grant different types of attack. In the Real World, Attack Pieces grant a Bros. Attack to one of the brothers once all ten are collected. In the Dream World, they instead grant a Luiginary Attack to Mario. The brothers obtain their very first Attack Piece in Mushrise Park, given by a Toad after saving him from Thorbs.