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General Comparisons
After the Metropolis Zone boss has been defeated, the balloons don't pop until they reach the ground.
Mecha Sonic will appear again if you use a star post and fall down to one of the areas where he appears, even if he was already defeated there.
After defeating Mecha Sonic at the end of Sonic/Tails' Act, the results tally now appears, but Sonic and Tails won't do their victory poses and can still be controlled. Afterwards, the game cuts straight to Death Egg Zone without a cutscene.
Knuckles' Act now has the teleporter, but no rings.
If Knuckles' Act has been cleared and he has 0-13 emeralds, whatever ending (good or bad based on the collected Emeralds) will occur, no credits will appear, and the Sonic the Hedgehog 3 logo appears after Angel Island floats to its desired location rather than a Sonic the Hedgehog 3 & Knuckles logo.
If the ending is the "good" one, Knuckles will not jump out to the screen unlike the final version.
If one modifies a savestate so that it contains all 14 Emeralds, and clears Act 2 as Knuckles, a Sonic the Hedgehog 3 & Knuckles-esque ending occurs, with Knuckles, Sonic, and Tails all congratulating you. However, they again stand in front of a Sonic the Hedgehog 3 logo instead of a Sonic the Hedgehog 3 & Knuckles logo.
Act 1
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0525 prototype
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Final game
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Act 2
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0525 prototype
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Final game
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References