Sonic 2 Lost Level : Hidden Palace Zone

please note that this glitch can only be accessed via Game Genie

Description
here is how to get to Hidden Palace via Game Genie :

1. attach Sonic 2 to a game genie

2. type ACLA-ATD4

3. boot up Sonic 2 with Level Select & Debug enabled

4. select Death Egg, hold A-Start, however. the art itself has been removed which results in a glitchy (though still playable) screen causing you to fall to your death

The Hidden Palace zone was in the beta version of Sonic 2, but because of a excessive number in zones, this zone was erased