Top Descriptors chaotic Unpredictable map design, often testing unusual skillsets. , grid snap Objects are placed along a square grid, typically using osu!'s in-built grid snap feature. , visually dense Contains patterns where the amount of visible notes makes determining note order and/or timing difficult. , bursts Patterns requiring continuous movement and alternating, typically 9 notes or less. , improvisation Uses patterns that do not correspond to sounds in the music, often using hitsounds to add sounds in.