One more recommendation:
Master of Darkness (Castlevania type game)
You may also like Spiderman Vs Kingpin (not the same as the Genesis version). I wouldn't say it's a very good game myself but I like it (ah, nostalgia).
Sega Master System on the Way
Re: Sega Master System on the Way
cloudmaster is awesome. I don't know how alien 3 compares to the genesis version but if it's a port I'd go with the Genesis one.
Re: Sega Master System on the Way
Cloud Master is fun and pretty difficult.
In regards to Alien 3: The SMS version has different music, very different graphics, and I personally prefer the controls in the SMS version and find it controls more fluidly - one minor difference is that in the Genesis version you can only get off ladders by walking onto a platform; in the SMS version you can get off a ladder anywhere.
I find the Genesis version quite a bit harder than the SMS version - in large part due to the much larger graphics.
The level design is mostly similar but not the same.
There are also little additional features in the SMS version like pictures and cutscenes.
Also, Lion King for SMS is very different to the Genesis version. You might like that.
In regards to Alien 3: The SMS version has different music, very different graphics, and I personally prefer the controls in the SMS version and find it controls more fluidly - one minor difference is that in the Genesis version you can only get off ladders by walking onto a platform; in the SMS version you can get off a ladder anywhere.
I find the Genesis version quite a bit harder than the SMS version - in large part due to the much larger graphics.
The level design is mostly similar but not the same.
There are also little additional features in the SMS version like pictures and cutscenes.
Also, Lion King for SMS is very different to the Genesis version. You might like that.