The SM64 Special Edition

Description
The Super Mario 64 Special Edition was going to be a limited edition of Super Mario 64, which would have included some bonuses. It would have included a Mario plush toy, which would have been part of a KellyToy promotion event. A tag on the Mario plush would have given the player a code which would have granted them access to a greater challenge in the game. This challenge would have altered the AI to become more aggressive with the personalization to present harder challenges to the player.

Theorizing
As a consequence of a more aggressive AI, more anomalies would have been likely to occur in a playthrough of the game. Dynamic Level Rearrangement may have also become enhanced as the AI attempted to present more difficult challenges.

The Special Edition may have been canceled due to the enhanced AI causing dangerous anomalies, which would put people at risk. There may have also been a concern of the public discovering the game's personalization feature as it would have been far more prominent had this version of the game been released. What remained of the Special Edition may have eventually become Super Mario 64 DD, although this is merely speculation.