Hidden content

The remains of the scrapped level Hidden Palace Zone, found by hacking the final ROM of Sonic the Hedgehog 2.

Hidden content refers to content that is not documented in any instruction manuals nor seen in normal play. This can range from cheats that require the player to input hidden passwords or button sequences at certain points, Easter eggs programmed in by developers for clever players to find, debugging tools, or even unused code. This category documents all of these hidden tidbits found in Sonic the Hedgehog games, be it unused graphics, music, or otherwise.