Ok, So I might forget a couple here, but what games had something different about them as opposed to the arcade counterparts they were based off? I'm talking extra levels, different music, graphics, whatever you can think of. Obviously there's a difference in resolution and hardware capability in general but beyond that. Or, on the opposite end of the spectrum, which games are missing levels or features?
Cadash - Different writing/translation from Working Designs, I played through it a zillion times on the turbo but I can't think of anything really super different.
R-Type - I am more familar with the TG-16 version than the Arcade, but this seems pretty faithful. Isn't there an extra boss in the middle of the game that was added when they combined R-Type I & II into one card for the TG-16?
Splatterhouse - Obviously the mask was different, they also censored the upside down crucifix boss.
Tiger Road - I never owned the TG-16 one but it seems like an entirely different beast. The TG-16 version seem to have nicer artwork, also, stylistically speaking. Anybody played both?
Space Harrier - We talked about it recently in another thread but I can't think of any distinguishing gameplay features to give you a reason to play this over say, the Sega Ages port.
Side Arms - Only 1 Player, different 1st level music, you have to pause to change weapons. I didn't love this game a whole lot when I had it as a kid, so anyone who did make any other observations?
Ordyne - I only recently got to see the arcade machine. There seems to be a lot of stuff in the arcade version that isn't in the TG-16 one, but then again the TG-16 version was the only way to play in the USA for a long time to my knowledge. They seem pretty different to play through.
Galaga 90, Fantasy Zone, Pac-Land - These seem like pretty good straightforward ports, I didn't notice any extras.
Ninja Spirit - PC Engine mode that gave you hit points instead of dying after getting hit once.
There are others I'm not sure about:
Chase HQ
Raiden
Dragon Spirit
Bravoman
Vigilante
What do you guys think? Any more you can think of?