Sonic Jam/Hidden content
From Sonic Retro
The following contents of this page reflect stuff that was inadvertently or purposely left hidden in Sonic Jam.
Isolated Sidewalk
By fiddling with the camera in Sonic Jam, you can find a unused piece of sidewalk behind the waterfall. It's not accessible, but it likely has no purpose.
Unused Music & Sound Effects
Through digging, a short, unused music track was found inside the game, as well as an unused sound effect.
Hidden Desktop Images
By inserting the Disc into a PC four desktops can be found by checking the /Extra directory.