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General Comparisons
Act 1 begins with Sonic and Tails falling from the sky in their standing poses, as was the case in the previous prototype.
The first Giant Ring that Sonic and Tails can encounter in Act 1 now leads to Hidden Palace. However, if they have all the Chaos Emeralds, they will not warp to Hidden Palace and instead receive 50 rings. Strangely, the rest of the Giant Rings don't flash.
Knuckles' first Giant Ring in Act 1 does not yet lead to Hidden Palace, meaning he has to backtrack to Sonic's first Giant Ring to go there.
One of the giant rings in Mushroom Hill Zone isn't put in yet, instead it is filled with a diamond pattern of rings.
The super ring before the transition to the Jet Mobile in Act 2 is still missing.
The exit from the highest super ring in Act 2 is different.
The Act 2 boss's starting position is shifted to the left slightly from the final. This allows you to score endless hits on the boss without destroying the satellite, and the battle won't start until you hit the satellite itself, thus it was changed in the final so the player cannot do this. Unlike in the 0408 build, the first 7 hits on the boss will count towards defeating it after destroying the satellite.
The boss does not explode when killed until he crashes into the tree.
References