Princess Peach's Castle/Castle Fields

The Castle Fields is an anomalous section of Princess Peach's Castle found in some personalized copies of Super Mario 64, appearing in place of the Castle Grounds or Castle Courtyard. They are most commonly found by jumping down to the area from the anomalous Castle Balcony, though can be found through the standard means of the area it replaces.

Geography
The Castle Fields appears a simple, open area with several hills, a river and/or lake occasionally reported. Some flower patches have also been documented, though otherwise very few geographic details have been documented in more than one report. There is reportedly no way back to Princess Peach's Castle in most appearances of the Castle Fields, even if it was accessed from the castle, with the player simply being teleported back to the castle after collecting a star in the area if a star manifests.

Stars
Despite the overall lack of levels in the Castle Fields, as well as geography, several stars have been reported to appear in the area. The most common is a red coin star and/or five secrets star, though others have been reported to be collected by finding a star at the bottom of the lake, walking into a flower patch that teleports the player to the star similarly to the flower patches in Bob-omb Battlefield that can teleport the lpayer, and obtaining a star by climbing to the top of a large hill.