This is another hidden level on sonic 2. It's the wood zone...except it's just a messed up version of Emerald Hill zone!! There are no enemies, pretty empty level. Still it's glitchy and messed up. I will play the wood zone re-made in that other game Sonic 2 lost worlds. So I did access a playable level of Hidden Palace zone on a sonic 2 beta, only the level is half finished thought it does have enemy sprites. I will look for a longer version on a beta rom but may not find one. Will post it soon. Also there is a hidden palace zone sonic 2 on a new version of sonic 2. Plus there will be the hidden palace zone on Sonic 2 Lost Worlds I think.