The "extra quality" typically associated with the v106 version refers to the smooth HD pixel animations
While the studio has moved on to other projects, the demand for the v106 Extra Quality build remains high. Due to digital distribution rights, you cannot buy this specific version on Steam anymore (it was delisted in favor of v108). However, owners of the original game can often download the "Legacy Branch" via the game’s properties menu on PC. dark hunter kuro v106 by pierock games extra quality