What 'Elements' -make a great level?

[AdrenalinDragon]

^This

Minus YCTaOFNT: You don't put the hardest of the hardest stuff in a set you make everyone play, but something a bit easier with mostly the same concepts, adding a note referring to said level, so that interested people go ahead and play it to their own pleasure (and suffering).

As long as you don't put a level like You Can't Teach An Old Frog New Tricks as level 1, I don't have too much of a problem with it.