Question re: Scoring

I've been using Chess Mentor steadily for about two weeks, and I have to say, of all the tools on Chess.com, it is by far, my favorite. Well done.

I get the impression that the author of each individual challange is allowed to assign their own values to wrong moves, revealing hints and the like. Is that accurate?

It seems to me that on some challanges, making a wrong move might only lower the score by a point or two. I just recently played one and a wrong move cost me something like 40 points!

I'm curious if a) I'm right and b) if there are any guidelines or rules for this? For example, if a challange is scored at 1800, is a wrong move more costly than a 1200 challange? Or perhaps if there are only four moves, a mistake would be more costly than if there were 10. 

Just curious is all. I really do love the tool!

Please see http://www.chess.com/chessmentor/help.html#rating for more information on the Chess Mentor scoring and rating.

Cool - thanks!