Yellow Secret Egg
From RWP Wiki
The Yellow Secret Egg is a mysterious item in the Banjo-Kazooie series.
The Yellow Secret Egg is one of the seven Stop 'n' Swop items. It is a large, spinning yellow egg with large white question marks imprinted on it.
In the Games
The Yellow Secret Egg is one of the Stop 'n' Swop Eggs that is not shown to the player normally. It is absent from the ending scene where Mumbo shows off the Ice Key, Pink Secret Egg and Blue Secret Egg. The only way it can be seen is by typing in its code, "CHEAT NOW BANJO WILL BE ABLE TO SEE IT ON NABNUTS TABLE," into the Sandcastle in Treasure Trove Cove. After typing in this code, the Egg appears on the table in Nabnut's house in Click Clock Wood. In Banjo-Kazooie XBLA, entering the code will cause the file currently in use to stop saving, disable Achievements and remove the player from the Leaderboards until the game is reset. Instead, the Yellow Secret Egg will be available once the game detects a save file for Banjo-Kazooie: Nuts & Bolts.
In Banjo-Tooie, the Yellow Secret Egg appears again. This time, it is found inside Heggy's Egg Shed and much be hatched by Kazooie. Doing so unlocks the Jinjo as a playable character in the Squawkmatch multiplayer mode.
In the Xbox Live Arcade version of the game, the prize that the Yellow Secret Egg rewards depends on the order the Eggs are hatched, as in this version, prizes are not tied to a specific Egg. For the list of prizes, see Stop 'n' Swop of Banjo-Tooie XBLA.
Banjo-Kazooie: Nuts & Bolts
In Banjo-Kazooie: Nuts & Bolts, a Yellow Secret Egg marker can be found in Showdown Town. When the Yellow Secret Egg is collected in Banjo-Kazooie XBLA, a Stop 'n' Swop Crate appears on it, containing the Googly Eyes vehicle part.