Pirates!
Sonic and Knuckles
Mega Zone
Paladin
Suck My Left One
Suck My Left One was a pretty good follow-up to Suck My Right One. SMRO had a much better climax by the end of the game, but overall it was over a little too quickly. SMLO improved the pace by being much more enjoyable over a longer length of time. I heard the Japanese versions were actually censored.
Since Japanese censorship is often just large pixelation, it was implemented seamlessly and even gave a Mode 7 type effect.
LO was ok, but RO was much better with a group of friends. LO seemed like it was designed from the ground up with solo play in mind, and multi player was an afterthought.