OBJECTION!
Different levels might have different gameplay style, correct. But there is a certain game mechanic that will be common in all the levels! That is... non-linearity!
*Evidence present sound*
Recall my previous comment about squiddster's levels.
*FLAAAASHHBAAACK*
Did you see anything odd?
Yes. Almost every level was oriented around making games! That's why, almost all the levels must have this non-linearity mechanic, since you can develop a game in many different ways!