From the Super Mario Wiki, the Mario encyclopedia
A Mushroom Drop is a yellow Mushroom found in Mario & Luigi: Partners in Time. They replace the Nuts from Mario & Luigi: Superstar Saga. When used, it recovers fifteen Heart Points for all party members. Dr. Shroobs and Pidgits have a 15% chance of dropping a Mushroom Drop when defeated, and the Hammer Bros have a 50% chance.
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