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A Goomba Coin is an item in Puzzle & Dragons: Super Mario Bros. Edition that allows the player to transform Goomba-type enemies into stronger forms. Goomba Coins can be obtained by defeating Goomba-type enemies or by winning them in the Lucky ? Blocks game in Toad Houses.
Transforming Goomba-type enemies into stronger forms require a certain amount of Goomba Coins. Transforming a Goomba into a 2-Goomba Tower requires three Goomba Coins, and transforming it further into a 3-Goomba Tower requires six more. Bullet Bills can also transform with Goomba Coins into the enemy "Bullet Bill & Goomba" with three Goomba Coins, and can be transformed even further to "Bullet Bull & Goombas" with six more.