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An offset is a setting that shifts and aligns different elements of a beatmap temporally, such as the audio track, hitsounds, hit objects, or background video. There are different types of offsets in the game that affect different elements.
Depending on the type of an offset, they are either set by the beatmap creator, customised by the player, or adjusted by one of the website's administrators. Most offsets are applied on a per-beatmap basis, with the exception of the universal offset.
Local offset, a per-beatmap setting that shifts all gameplay elements relative to the audio track.
Online offset, a timing change applied by the
NAT to
Ranked beatmaps with incorrect beatmap offset in order to adjust it.
Universal offset, a setting that globally affects the timing of beatmaps by shifting the audio track relative to all other gameplay elements.
Uninherited timing point ("red line"), the start of a new
timing section. Timing points reside at an offset relative to the start of the audio file, but the timing point itself is also sometimes called "offset".
Beatmap offset, the amount of time between the start of the audio file and the song's first
downbeat, as controlled by timing points.
Note: Lead-in and video offsets are only editable through beatmap file editing.