The 151st Star

Were you looking for the 121st Star?

The 151st Star is an anomalous Power Star that can be found in many personalized copies of Super Mario 64 DS. It was one of the most popular rumors when the game was released, as people believed there might be more beyond the 150 standard stars in the game, just like how they believed Waluigi was unlockable. The way to get the 151st Star is very inconsistent, likely as a result of playground rumors being blended with true personalized experiences, though some methods are more common than others, likely the actual ones that were found by players.

List of Methods
''Below is a list of some of the many ways to supposedly unlock the 151st Star. Note that some of these may be fabricated due to the widespread nature of this rumor, or could be found simultaneously to add up to 152 or more.''


 * Collecting any star in a full anomalous course such as Rabbit Meadow or expanded versions of Battle Fort and Sunshine Isles.
 * Finding the Purple Rabbit.
 * Collecting any star in an extra level like the Piranha Pit and other StarPass levels.
 * Obtaining the Power Star in test_map.
 * Defeating Bowser in Bowser's Chamber.
 * Clearing the extra version of Chief Chilly Challenge.
 * Defeating the Mad Piano using Yoshi.
 * Somehow defeating Dazzling Waluigi in Waluigi Mode. This has not been confirmed, but has been heavily speculated about, but it likely isn't true due to the mode's nature as a punishment.
 * Finding an 8th mission in any regular course, which usually is impossible. This usually requires the anomalous abilities of Wario and Yoshi, or Waluigi to obtain. The most common of these is the Easy Way Out if it doesn't replace another mission.
 * Clearing Bowser in the Dark World as Yoshi. This usually occurs alongside the Halved Key phenomena, requiring the player to beat the level as Mario to unlock the basement.
 * Reaching Peach's Balcony.
 * Finding any extra star tied to the Switch Palace.
 * Entering the Black Box.
 * Talking to an inverted Toad in the Negative World, usually one of the same Toads that gives you a regular Power Star in the main hub.
 * Catching one of the supposed Waluigi plushies in the Negative World.
 * Collecting 100 coins in any small level. This is usually impossible in the unpersonalized game.
 * Catching another set of glowing rabbits.
 * Finding a 4th star-giving Toad.
 * Collecting the star at the end of Bowser in the Sky, which usually does not increment the star counter in unpersonalized copies.
 * Completing the Submerged Castle event.

Theorizing
While most of these are likely just playground rumors, some of them may have been legitimately implemented by the Personalization A.I. Some of these methods may have been part of an earlier build of the game that had a higher star counter, specifically the ones involved with new areas not found in the main game. Notably, some of these methods have also been reported to be ways of finding the 121st Star. Due to the similarity between these 2 anomalies, it would make sense that they overlap.