From the Super Mario Wiki
The Mushroom Field is an area in Mario Party Advance. It is located in the Desert Area of Shroom City. It is a large, coliseum-esque area, with stone walls circling around a sand floor and small flags outlining the perimeter. There are also smaller fields marked for measuring a hammer's thrown distance. The Mushroom Field is used primarily as a location for the "Hammer Camp", where people practice and improve their skills with hammers. Hammer Bro is one of those people, who practices at the Mushroom Field every day. He also urges the player to try out hammer throwing, which starts the Hammerama quest, and the two of them attempt to throw the farther hammer on a couple of the smaller fields. When the player throws their hammer the farthest, Hammer Bro gives them the Mini B-Ball Gaddget as a trophy before immediately returning to his training at the field.
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