Sonic Jam/Hidden content
From Sonic Retro
Isolated Sidewalk
By fiddling with the camera in Sonic Jam you can find a unused piece of sidewalk behind the waterfall. It's not accessable but probably has no purpose.
Unused Music
A unused Short music track was found inside the game. A download link can be found [[1]].
Unused Sound Effects
A unused sound effect was found inside the game. A download link can be found [[2]].