A Gaggle of Goombas
From the Super Mario Wiki
A Gaggle of Goombas is the second secret level of Gwarhar Lagoon in the Minion Quest: The Search for Bowser mode in Mario & Luigi: Superstar Saga + Bowser's Minions. In order to obtain this level, the player has to use certain amiibo to unlock it.
The level consists of mostly Goombas, Paragoombas, and Goomba Towers and has only three battles. The first battle has five Goombas at the front, two Paragoombas at the back, and a Goomba captain. The second battle has three Goombas, two Goomba Towers, two Paragoombas, and a Goomba Tower captain. The third and final battle has five Goomba Towers, two Paragoombas, and a Paragoomba captain.