Sonic And Knuckles Collection is a game for Windows 95-98 that is basically just a port of both Sonic 3 and also Sonic And Knuckles, although it also includes Sonic 3 & Knuckles as well. It has a few interesting things, such as using prototype S3 tracks instead of the normal ones, and also using midi instead of normal music files. There was also a unnamed track in the files that also comes from the S3 Prototype, which people speculate to be a prototype Super Sonic theme.
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