Rainbow Village

Rainbow Village is the name given to a mysterious village similar to Bob-omb Village that appears in the background of the Rainbow Ride stage in Super Smash Bros. Melee, and a related anomalous level reported in some personalized copies of Super Mario 64. The level was first theorized to exist after people noticed the village in the background of the Smash Bros. stage and found it a bizarre addition before people began reporting it to appear in their copies. The most commonly reported method of reaching Rainbow Village is by finding a hidden warp somewhere in the level, such as simply running into it, using a cannon or activating a path of boxes towards the skybox that leads to the warp similarly to the Lost Spikes.

Description
As the name and appearance in Super Smash Bros. Melee suggests, Rainbow Village is a small town with trees and paths scattered around found on a mountain side, usually reusing assets of some kind from other levels, such as houses from Wet-Dry World or textures from Princess Peach's Castle. The ground is supposedly littered with the unused Dancing Flowers in some copies. It also reportedly houses a statue similar to that of the Toad Shrine, but whether or not it is related is unknown. Alternatively, the statue has also reportedly been the same one seen in the Castle Courtyard or a unique statue of some other character such as Princess Peach or Mario. The outside area itself usually does not have any enemies, though Piranha Plants, Goombas, Fly Guys, Chuckyas and Lakitus have been reported to appear.

The level is usually filled with Toads or Bob-omb Buddies who inhabit the houses, though friendly versions of Goombas, regular Bob-ombs and Koopas have been reported, similarly to how other anomalous areas such as His Domain and Peaceful Grounds reportedly have unique friendly NPCs that are usually encountered as enemies in the base game.

The main part of the level is reportedly found in the houses, which are reportedly enterable in several copies, either being simply part of the main geometry or entire subareas. They usually contain more NPCs and resemble standard houses, though some reports claim that they contain special areas such as slides or even the Bowser Room, though these claims are relatively unsubstantiated. These houses typically contain most missions, as well as more detail than the outside area in most reports.

Missions
Most reports say that the level does not have a full set of missions, simply having a red coin star, getting a star by talking to one of the NPCs similarly to the Toad stars in Princess Peach's Castle, or exploring one of the houses. However, other reports mention a 5 secrets star in the outside area, somehow "activating" the statue in the level, or following a stray path through the mountain to a star, though these are harder to verify and are mentioned much less often.

Theorizing
It is believed that Rainbow Village appeared in Super Smash Bros. Melee as a reference to this level. Some suggest that the creators of the map didn't know that Rainbow Village was cut, explaining why it is present, though others say they still could have left it in as a nod to the removed level. Still others say Rainbow Village appeared in the personalized copies of those developers, making them think it was a regular thing, explaining why it appeared in the Rainbow Ride map.

It is possible that some sections of Rainbow Village are created through Dynamic Level Arrangement or Procedural Generation, particularly the outside area due to it's lack of detail compared to some of the houses, though they may be AI-generated themselves due to supposed room repetition or entire lack of a regular interior, rather containing a special area, likely due to no regular house areas appearing in Super Mario 64.