From the Super Mario Wiki
Summer Shootout is a course which appears in the Story Mode of Super Mario Maker 2. It is given to Mario by Yamamura after completing both Coin Collecting on an Unmanned Airship and Swamp Escape by Shell! for the first time, subsequently playing another level, then inspecting Undodog's Dry Bones Shell. The course has a difficulty rating of 4/4 stars. Completing this course for the first time rewards the player with a Yamamura Shirt.
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