Level in Super Hexagon. It cannot be selected, only being accessible by surviving 60 seconds on Hyper Hexagonest. It is unbeatable; once reached, players remain in this Level until they inevitably crash. There is no base rotation or pulse, but at least as much spin as in Hyper Hexagonest. In addition, the screen will sometimes rotate by exactly one segment to disorient the player.
The lack of rotation limits peripheral vision, significantly increasing the need for awareness and aptitude.
The music is Focus but  slowed down (and reversed).