Super Mario 64 DS

Super Mario 64 DS is a Nintendo DS remake of the original Super Mario 64, and one of the system's launch titles. Unlike the version on the Nintendo 64, Super Mario 64 DS stars four playable characters and has the player start off as Yoshi, trying to rescue Mario, Luigi and Wario inside the castle walls.

It's unlikely Super Mario 64 DS has the same algorithms as Super Mario 64 to personalise its copies for the players, although it has its own intrigue around it with its own beta builds and the possibility of a fifth playable character, Waluigi.

Waluigi

 * Main page: Waluigi

Upon its release, Waluigi was highly speculated to be playable in Super Mario 64 DS, finishing the set of four plumbers in the game. The fourth key door outside the rec room seemed to support this, although all it contains is a star and can be unlocked by finding all the shiny white rabbits.

Several rumors and fake images were created around Waluigi, most famously the Purple Prizes rumor. This fake newsletter claimed that Waluigi could be found by being the "fastest footracer in the land" and defeating the secret "Rabbit king", and only then will Waluigi be playable. However, this was an April Fools joke orchestrated by deviantART user King-Bowser-Koopa.

Trivia

 * With some personalised copies of Super Mario 64 featuring Luigi or even Wario as playable characters, it's possible that Super Mario 64 DS is based of a heavily personalised version of the original Nintendo 64 game.