The result with Knuckles as a player is Sonic 2 final worked exactly like Knuckles in Sonic 2, except that Knuckles is blue and uses the wrong mappings. I can see his head, and he can glide and climb on walls. In Sonic 1, Knuckles never shows up, and he dies before the title cards has disappeared. In Sonic 2 Beta, Knuckles is blue and looks the same way as he does when I ported him into Sonic 2 final. The floor detection doesn't work very good, so he's stepping forward like if he's gonna fall all the time. But he can't glide or climb. I have no idea why. He just jumps normal like Sonic except he can't jump as high as Sonic, or Tails. Well playing Knuckles in Sonic 2 with Tails in 2 player mode works! But if Knuckles dies, he will restart the zone and Tails has nothing to say about it. If you're interested in the ROM, then I can upload it. I'm not sure if someone has ported Knuckles before.