No Sleep at Magikoopa Keep
From the Super Mario Wiki, the Mario encyclopedia
The course takes place in a tower with six levels which can be accessed via warp pipes, as well as a persistent Magikoopa that follows Toadette and continuously fires magic at her. Once she reaches the sixth and highest level, two more Magikoopas will appear and together they all attack in unison. They must be beaten via the nearby Turnip Cannon in order for the Power Star to be revealed.
By angling the camera to look down at the tower from the top in a very precise angle, an 8-bit Luigi can be seen over the tower.
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