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Attack Pieces are special puzzle pieces 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/Bros. Attack.
Most Attack Pieces can be found in blocks that resemble them.
Bowser's Inside Story
Attack Pieces in Bowser's Inside Story grant Mario & Luigi with a Special Attack.
Attack Pieces make a return in 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 Bros. In the Dream World, they instead grant a Luiginary Attack to Mario.