So, I'm sure a lot of this could be answered with debug mode but the debug mode cheat for Sonic 3 is F'in hard to do and I'm lazy. How much of the extra content from S3K is on S3 cartridge? I know that the level select has Mushroom Forest/Hill, Flying Battery, and Sandopolis. How much of these levels are actually on the cartridge? Are the alternate paths for Knuckles patched in, or are they present on the S3 cart? Little changes in the first six levels like the spike in Act 2 of Hydrocity that becomes a 1UP, these are patched by the S&K cart I'm sure, probably not present on the S3 cart. Is the extra area of Mushroom Hills with the first super ring and everything present when playing S&K by itself, or is that only loaded as part of the level when S3&K? Were Lava Reef, Sky Sanctuary, and Death Egg zone planned in Sonic 3 and just not present in the level select, or were they added to make S&K a complete game? In other words, would a complete Sonic 3 if S&K hadn't been a thing ended with Launch Base zone?