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As said before: it's prolly from Sonic JAM (SATURN).
It has a movie gallery, with a buncha Sonic videos, and, among those, there are "complete" versions of the Sonic CD intro.
If you ever unlocked everything in Sonic CD, you'll remember the "pencil test" mode, that shows pencil-only animation sketches for sequences that did not make it into the intro/ending animations.
Well, all those scenes were finished and put back into Sonic JAM.
Also, the videos in Sonic JAM also have a much bigger (nearly full screen) screen size, and higher framerate (smoother animation). Since they increased the framerate, the videos runs slightly faster (mostly the intro), and they needed to add extra scenes so the music would fit. |