From the Super Mario Wiki
The Bowser Stadium is the final field in Super Mario Strikers and later in Mario Strikers Charged. The capacity is 50,000 and it is made out of Rubber Compound. It is the special field for the Bowser Cup and Super Bowser Cup. The finals take place in this field, which itself takes place in the Deep Space.
When players decide to stop here, they will meet Bowser and his cohort, Koopa Kid. Their quest, Goal Tenderizer, involves players shooting past three out of five soccer balls past Bowser. After that, he'll challenge them to the Bowser minigame Splatterball. If players succeed at defeating the set number of Koopa Kids, Bowser will reward them with the Gaddget, Snooze Ewes.
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