Pikmin Unused Objects: Door & Key (works ingame!)
You might have seen the models of the unused key and door in Pikmin 1, but did you know that they are actually operational if spawned correctly?
There is a "door" object and a "key" object that can be spawned through the .gen files (files that define object placement in Pikmin 1) and they use the otherwise unused door and key models.
The key can be collected and disappears. The key is used with the door.
There are two door variants: A small door and a big door. The small door locks Olimar in place when you touch it from the front (where the key hole is) after collecting a key, I do not know why. The big door seems to actually work as intended because it disappears with a silly animation when you unlock it. The game keeps track of how many keys you collected and when you use them, so you have to get a new key.
One caveat: Only the Windows Debug version of Pikmin 1 loads the door and key models out of the box. The final Gamecube build doesn't load the model. By injecting asm code the game can be made to load the model so I was able to record this video in Dolphin. Also, the small door seems to spawn by default when you spawn a door object. I do not know how to spawn the big door except by forcing the door's type in the game's code.
Credits to user "The JustGreat Minty Meeo" for discovering that the door and key can be spawned. To my knowledge he was the first to spawn the small door and the key in the Windows Debug version of Pikmin 1.
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