Скачать Хаки + эмулятор Sonic 1 & Knuckles: Yes, a hack. Locking Sonic 1 onto Sonic & Knuckles would play "Blue Sphere", not S1K. Well you can spindash and climb.
Shadow in Sonic 2: I haven't played much of this. There's mismatched music, different order of levels, different backrounds. When they skid they look like Tails and Sonic, but they keep the colors.
Mighty in Sonic 1: You know, Mighty? From Knuckles' Chaotix? The guy that could walljump? Me either. Music is different. Colors are changed a lot. The levels are completely redone.
Sonic 2: Advanced Edition: It's supposed to be difficult. While it has its moments, it's nothing like IWBTG or Kaizo Mario. The graphics are redone. If you try any Sonic hack in this video, make it this one.
Sonic Tikal: Sonic 1 with Tikal from SA. The character is changed everything else is the same. Going up or down certain slopes (half-pipes) revert Tikal to Sonic briefly.
"Sonic Jam 6" got recorded for some reason. It's a terrible "Sonic in Mario" thing. It kept desyncing so I couldn't record. The hit detection is terrible, it's glitchy as hell and the music is awful. It's actually a pirated game, not a hack.