Which game had the best level design

Which Mario game has the best level design? Hmm that's a tough one. I would have to go with either Super Mario World or Super Mario Bros. 2
 
I would say Super Mario Bros 3 and honorable mention to the cannon levels in New Super Mario Bros 2.
 
Sort of impossible to compare 2D to 3D games, so I'd give a couple nods to Super Mario World and Galaxy 2. Also...

Nabber said:
Definitely World.

...I want your sig gif. Where is it from?
 
I don't know what game has the best, but Lost Levels has by far the most interesting, and at the same time unforgiving level design. I actually kind of liked how well the levels worked with the original SMB engine once you've died a couple hundred times.
 
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