Top Descriptors difficulty spike Contains a sudden and significant increase in challenge within the map's gameplay. , bursts Patterns requiring continuous movement and alternating, typically 9 notes or less. , aim control Patterns with velocity or direction changes which strongly go against a player's natural movement pattern. , alt Colloquial term for maps which use rhythms that encourage the player to alternate notes. Typically distinct from burst or stream maps. , freeform An unrestrained and loose approach towards visual structure.