What is Blue Zenith?

727

A map where osu! legend Cookiezi (better known as shigetora, nathan on osu, chocomint) has got 2 727pp plays; one with Hardrock and another with Hidden Hardrock. The osu! community sees it as a meme because Cookiezi couldn't get anything better than 727 on Blue Zenith, and the number just relatively looks nice.