From the Super Mario Wiki, the Mario encyclopedia
TNT Drumsticks are consumables that Bowser exclusively has access to in Mario & Luigi: Bowser's Inside Story. They are the strongest form of drumsticks, excluding the Cheesy Drumsticks in the remake, eclipsing the Hot Drumsticks and the Fiery Drumsticks. If consumed, Bowser instantly restores 280 Heart Points, making it the strongest healing item in the game. It can be bought from Broque Monsieur's item shop after the boss fight against the Tower of Yikk for sixty coins. A few enemies have a chance of dropping one after fighting them: Choombas and Toothies have a 30% chance, while Crawfuls and Jailgoons have a 5% chance.
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