Super MD:Unused Locations
Unused Dungeon Maps are found within Template:GameTitle. These are not actual dungeons, but unused scenery found in the game's code that dungeons use.
Unused Scenery
Time Travel Lake?
An unused area with a Celebi waiting for you. As stated by Amoonguss, in the middle of the Mystical Forest resides Celebi, in Time Travel Lake.
Unused Shiny Celebi Meetup
This is another unused area involving Celebi, which is the shiny version this time. It's unknown what dungeon this place was intended to be in.
Unused Aquatic Environment
There is another underwater aquatic environment in the game. It's unknown whether this would have been used in the story.
Unused Rocky Area
A rocky area similar to places like Redland Reaches and Ochre Quarry in terms of dungeon structures and generation, with a different color palette.
Unused Savanna
An bright, golden savanna. This generates similarly to Withered Savanna and Eastern Savanna.
Unused Forest
A deep aquamarine forest that has the same map generation as forest environments such as Moonlit Forest and Inflora Forest, etc.
Unused Beach
It appears to be a frozen version of the typical warm, tropical beach.
Unused Mountain
An environment similar to places like the Crags of Lament and Sheer Mountain Range, etc, but it's completely apricot colored.
Unused Meadow
A dreamy-looking area with dungeon generation resembling places like Breezy Meadow.
Second Unused Beach Map
The second unused beach environment.