Rameau: Les Cyclopes

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I was looking to learn another level 4 piece and found Rameau: Les Cyclopes.  I like this one a lot but it seems to be much harder than a level 4 piece though it is labeled level 4 on this site.  I was wondering if this is correct.  I know a few level 4 pieces but they don't seem nearly as difficult as this.  The reason I am asking about the level is because I am working on a more challenging piece and don't want to take on too much.