Top Descriptors variable timing Contains multiple timing points, usually required for songs not recorded to a metronome. , circle only Restricts object choice to circles only. , complex sv Features large changes in slider velocity. , progression Contains a gradual advancement in difficulty or concept across the map. , slider tech Tests uncommon skills involving sliders, such as heavy use of kicksliders or aim on complex slidershapes. , high contrast Uses flashy ideas to follow changes in the music, creating stark differences between different sections of the song. , reading Tests a player's reading skill, i.e. patterns that obfuscate note order and/or timing. , gimmick Focused on a single unique design or gameplay idea. , double taps Patterns that require tapping on both keys simultaneously, through 2B or very fast doubles. , avant-garde Employs boundary-pushing and experimental philosophies to map design, often foregoing gameplay and aesthetic conventions to extreme measures.