(Unlurk)
My favourite level has to be Spring Hill Zone. Yes, I know it's not a 'real' level persay, but it's such a phenomonal level. I loved playing NiGHTS, and I think AJ did a better job here than most professional level designers ever have; by making the level fun, fit into the overall art style and by achievinh something of a technical feat - it's really not that easy to make a NiGHTS level, I assure you! ;)
As for poor old CEZ2, I designed that level with the intent of just throwing in a little variation to the whole 'run through stages quickly' theme, and only really intended it for use in the Final Demo it appeared in (someone will have to help me out here, as I can't remember the version number ;D). It was also pretty easy to make and was more of a show of what could be done if you wanted to create a more puzzly-style level (although, yeah, I know, hitting switches isn't a particularly taxing puzzle...!). That said, it's not one of my favourite levels either, but simply put, I didn't put as much effort in thought into as I did GFZ2, which was then further refined by AJ and Mystic.
(Relurk!)
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Johnny ('Sonikku')