If Knuckles normally has a totally different route then Sonic/Tails, how is this possible? Here's how: Remember running as fast as you can in Sonic 1/2/3/& Knuckles, and suddenly glitching through the floor and getting trapped in a room with no way out except to hit reset? Even Sega knew about it, they warned you that Robotnik had "Inescapable traps" in the Sonic 3 instruction manual. But this time, I got the good end of the glitch, I glitched through the floor while running with Knuckles and ended up in Sonic's path, and got to fight Dr. Robotnik in the sky with Knuckles being carried by Tails. Of course it gives the default ending afterwards, Tails carries Knuckles off but the next area starts with Knuckles just running in. A great glitch, a once-in-a-lifetime experience.