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Pro Shows commonalities of well designed levels
The tutorial picks apart great level design and shows what makes it great.
Pro Kept updated
The original 8 page article came out in 2013 and has since seen updates and improvements.
Pro Available also as a (somewhat outdated) PowerPoint presentation
The origins of the tutorial come from this presentation. The article has built on top of it and updated out-of-date parts. It will still give you a good overall understanding of the topics discussed in the tutorial.