Scores are disabled due to an undetectable debug cheat code that can give you free points.
By plugging Sonic 3 into the top of Sonic & Knuckles using the unique "Lock-On" technology you can replay the game as Knuckles. Some of the levels contain areas that are only accessible using Knuckles leading to speculation that this game was designed with "Lock-On" technology in mind, or (more likely) that Knuckles should have been present from the start, only to be dropped later in development.
A Button = X B Button = C C Button = V Start = B D-Pad = Arrow KeysRight click game for menu options. You must be logged in to use save states and submit scores. Right click the game to do so. If you load a save state your score will not count. Only the first score you submit will count. You can submit a new score by reloading the page and starting over. When you create a save state or submit a score there will be a short pause but no obvious confirmation. A moderator will review your score before it is added to the high score board. If your score is not on the screen when you submit it, then the mod will not approve your score.