What 'Elements' -make a great level?

[geodave]

Waterslide was terrible until I learned about the easier solution!

I'm a huge fan of Suspended Animation, even if my favorite solution only works in Lynx.

Avalanche was very hard, but once I got into it it was addictive. Same for YCTaOFNT, except that the teeth part at the very end was truly Diabolical (unlike Diabolical, which was pretty darn easy.)

Also a fan of YAYAP. Sure it takes forever, but once you figure out the trick is the bouncing block, it's straightforward.