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Being a Sonic the Hedgehog 3 zone, Marble Garden Zone doesn't have a lot of differences in this build compared to Sonic 3 & Knuckles.
The Act 1 mini-boss crash glitch from Sonic 3 that can be achieved with a second player is still there.
Two sets of spikes were added to this room that weren't originally there in Sonic 3 final. However, it is possible for Knuckles to defeat the Strange Relief's eye and gain access to Sonic's path by hurting himself, standing on the spikes during brief invincibility time and jumping into the Relief's eye. Later builds and the final removes the second pair of spikes and places a wall to prevent Knuckles from going this way, and also adds three Rings to the room.
It is possible for Knuckles to climb walls during the rising floor sequences, whereas he cannot in later builds and the final. A platform was also added to this spot later.
This platform was moved to the right in later builds to make it easier for Knuckles to defeat the Strange Relief in order to proceed.
A set of spikes in the ceiling were removed from this spot in later builds. Also, if Knuckles were to move forward, then backtrack here, the earthquake will start again for about one second and end again.
Knuckles' battle against the Drill Mobile plays the Sonic 3 mini-boss theme, and has no sound effects.