You can see from the 3 work-in-progress screenshots that there is a new debug mode cheat which was meant to be added as a part of the level engine for the game. There's also an flying mode cheat where it allows you to noclip by pressing "F" and then disable it by pressing "H". Usually when you reach to the end of a .EXE game, you get a notepad text file in the windows desktop for let's players to open it and see what's inside. Notice the new object called "object209"? Yes, it's for the new error screen about a player breaking the boundry in Knuckles's level meaning that you found a new easter egg when teleporting to the secret knuckles level. And last but not least is the Silver.exe origins cutscene! It's not just the one from Rouge.exe considering the fact about @JBM 's game being 7 years old, this time it's completely different and new! It mentions something about a REAL one who created an A.I character by infecting the PC while a player played sonic and then setting Sonic.exe FREE along with the other victim characters. The full room name is "rm_SilverTransformEXE_Chat".