PLEASE INSERT CARD

PLEASE INSERT CARD is the name of an anomaly that can appear in some personalized copies of Super Mario 64 in the form of an error screen. It is often described as a screen with a black background and the phrase "PLEASE INSERT CARD" in the center of the screen. However, the screen can be different, such as having a background or images of Mario dotted throughout the screen. The "PLEASE INSERT CARD" screen often appears during a transition to an area, such as entering a painting or collecting a star.

Theorizing
It is believed that the "PLEASE INSERT CARD" screen manifests after the Personalization A.I. experiences a fatal error, or a possible cancelled add-on to the Nintendo 64 is missing that would be vital to the Personalization A.I. at that moment. It could also be tied to the Nintendo 64DD, with the "CARD" referring to the disc of Super Mario 64DD.