Top Descriptors messy Visually chaotic and intentionally disorganised patterns, often involving many overlaps and unequal visual spacing between objects. , chaotic Unpredictable map design, often testing unusual skillsets. , collab A map with two or more associated mappers. , featured artist Features song(s) composed by artists in osu!’s Featured Artist listing , difficulty spike Contains a sudden and significant increase in challenge within the map's gameplay. , avant-garde Employs boundary-pushing and experimental philosophies to map design, often foregoing gameplay and aesthetic conventions to extreme measures. , mapping contest An entry for a mapping contest. , variable timing Contains multiple timing points, usually required for songs not recorded to a metronome. , alt Colloquial term for maps which use rhythms that encourage the player to alternate notes. Typically distinct from burst or stream maps. , improvisation Uses patterns that do not correspond to sounds in the music, often using hitsounds to add sounds in.