Textureless Mario Anomaly

The Textureless Mario Anomaly is an anomaly only known to exist in individual personalized copies. Encountering this anomaly implies future bugs and crashes.

While this anomaly is active, the HUD and screen will flicker. Various 3D objects, the pause screen, and other map geometry will appear to be black. When the objects are interacted with, the game will freeze or crash. In more personalized copies, an error screen will appear instead. Water textures will also appear to be completely transparent. All music and sound effects are muted while the anomaly is present.

Footage of this anomaly occurring can be found here.