This is Knuckles Engine from Sonic CD. Yea, i just replaced the sprites and added bonus stuff, but this game will be updated like next update will be released maybe 28.03.23 or 29.03.23. Version 1.0 Knuckles is playable, game is released. Some bug fixes? Version 1.1 New Giant Level Layout! Version 1.2 New Music '' Quartz Quadrant '' Added Signpost saying like '' Good Job '' Overall Bug Fixes, Fixed layout. Version 1.3 Some level layout tweakes, and a Spring at the beggining of the level