[Cybrax]

I believe you can get a score on the act 1 ones but im not sure.

[General Throatstomper]

I believe you can get a score on the act 1 ones but im not sure.

You can get a score there. the question is whether or not the score is recorded, and to my knowledge, it's not, unless you unlock a special stage you can play whenever you want. I'm not sure, I haven't owned the game for long

[CosmicFalcon]

None of the stuff from Special Stages is recorded. Nor can you unlock them in any other way but through a normal level.

Also you get shown your time at the end of Bonus Challenges, but you have to be damn quick to write it down. Both Bonus and Emerald Challenges total your score at the end, leaving it up for a short while, but not indefinately. Also on both you get an extra life for every 10000 points.

Yahuh.