2-Shapes: Sliders
Maps where the mapper has sliders in various shapes.
Can be both obvious shapes (circles, hearts), more stylized sliders (the twin swords at the end of Raise my Sword), oddly-shaped sliders (see Algebra [Hard]), or sliders that have unique shapes based on the song (those that have jagged lines in sync with the song.)
Note that simply having a curve or slant does not count, not even semi-circles. A slider that crosses over itself would count, however.