What 'Elements' -make a great level?

[thinker]

Instead of being negative: A positive idea is- I like to "see" what the puzzle area of the level is; where you can see what the obstacle actually is and reason out a solution right there and then. I personally don't like having to go all over the map to try and find some hidden element off somewhere else. (although, I have some of that in MyBest37 levelset) I don't think that it makes for the very best kind of levels that can be designed. Let's see what everyone thinks that 'THE' best kinds of elements are and what they like to see in them....that creates the most fun to play. I recognize that there are other threads that treat this subject or kind of thinking, but maybe, it would be good to MAKE A LIST, just like we are trying to do in the thread called: "Name that Strategy". Ian Wilson (thinker)