I'm glad the VC version of Sonic & Knuckles has it's lock-on and save feature intact for Sonic 3 & Knuckles.

It seems very nice that I can just press the minus button on the remote to toggle the lock-on games in the middle of the game. The best part is that it's also functional when running it from the SD card.

I noticed that they fixed the annoying high pitch spin sound and other sound inaccuracies that was from VC Sonic 3 in Sonic 3 and Knuckles.