List of Mario & Luigi: Partners in Time pre-release and unused content

These are beta elements from Mario & Luigi: Partners in Time.

Early iterations
The game was originally going to be called Mario & Luigi 2.

Early builds
An early screenshot depicts Mario, Luigi, and their baby selves fighting two red shoe-clad Blooper foes (called Scoot Bloops) in the Vim Factory. Little is known about this Blooper creature, which was unused.

Another early screenshot shows the gang using a Mix Flower on two Boo Guys in Hollijolli Village, while Boo Guys were not present in this area in the final game and Mix Flowers don't look or act this way in the final game. There are also screenshots of the four brothers using what appears to be a purple Spiny Shell as a Bros. Item. This item would act like a Koopa Shell, but would be hammered instead of kicked. Also in page 27 of the instruction booklet there are two images of Mario leveling up, here instead of having "stache" he has "hige" (a Japanese word for moustache). Finally, it may be notable that Baby Mario's initial artwork erroneously depicted him as having red shoes rather than his normal blue ones (this mistake was eventually changed and the artwork was re-released), although his shoe coloration would appear to have always been consistent throughout all of the actual game's programming.

Debug menu & unused room
Using the Action Replay code 94000130-fffa0000 + 1205e768-0000000c + 1205ef50-0000000c + d2000000-00000000, you can access a debug menu. Hold Select + A while loading your save. One of the selectable rooms will have an unused Yoshi Egg, and an unused chat bubble with a heart bubble.

Scoot Bloop
An enemy name in the ROM, Scoot Bloop, was totally unused. In all versions of the game excluding the Spanish release and South Korean release, it has been translated. Sprites of this "Scoot Bloop" have recently been ripped from the game and its unused data was discovered. Apparently, Scoot Bloops attacked by ramming into the player. Due to the data being unfinished, battling them in-game and letting them attack will cause a Scoot Bloop to attack and not return, or freeze the game.

Miscellaneous
Although the Japanese version of this game only gives players the option to play in Japanese, it actually contains at least a partial script in English, French, German, Italian, and Spanish as well. These often differ from what would eventually be released in the European version of the game. A list of changes can be found below.