Top Descriptors featured artist Features song(s) composed by artists in osu!’s Featured Artist listing , variable timing Contains multiple timing points, usually required for songs not recorded to a metronome. , time signatures Audio contains many changes in time signature or uses an uncommon time signature. , marathon A map with a drain time of over 5 minutes. , alt Colloquial term for maps which use rhythms that encourage the player to alternate notes. Typically distinct from burst or stream maps. , complex snap divisors Uses mixed or unusual snap divisors in order to test the player's tapping ability. , chaotic Unpredictable map design, often testing unusual skillsets.