Level 9 was a masterpiece. The player's starting point does not become one isolated place that is just left behind, it is placed in such a manner that you keep coming back to it. Just a huge palette of walls, textures and guards waiting to track you down. Feels so wide and open yet so crammed and tense in places. Wilhelm's boss level was very clever; again a large, open feel that sees all boss level cliches flushed down the toilet.
I agree. Technicolor was a very interesting design (if that's the still the map in Level 9 for this version).