|Hidden Palace Zone|
|Features in||Sonic & Knuckles|
Sonic 3 & Knuckles
|Preceded by||Lava Reef Zone|
|Proceeded by||Sky Sanctuary Zone|
Hidden Palace is a short zone appearing in Sonic & Knuckles and is where Knuckles keeps the Master Emerald. In the beta versions of Sonic the Hedgehog 2 a level called Hidden Palace also appeared, but was not present in the final version of the game. The two levels are not related beyond their name.
 Sonic 3 & Knuckles
 Sonic's Path
Here, Sonic meets Knuckles, who challenges him to a fist fight. Upon beating Knuckles it is revealed he was tricked by Dr. Eggman as Eggman scoots off with the Master Emerald firmly in his grasp. Knuckles attempts to fight Eggman but ends up electrocuted by Eggman's machine. Tired and beaten, Knuckles, realising he has been betrayed, leads Sonic to the Sky Sanctuary Zone, where Sonic eventually goes to defeat Eggman on the Death Egg. Note in the background of the Knuckles battle how there is a mural, depicting The Doomsday Zone at the end of Sonic 3 & Knuckles.
- Knuckles (Hidden Palace Zone Boss) - Full Article
 Knuckles' Path
The Hidden Palace for Knuckles serves solely as a filler level for him, as he passes through to grab the portal up to Sky Sanctuary Zone. It is here where Knuckles' game ends as he faces off a brutal Mecha Sonic.