v1.8.2
Source Code

Index

Checks listing

Audio

Audio channels in video
Delayed hit sounds
Frequent finish hit sounds
Imbalanced hit sounds
Incorrect audio format
Incorrect hit sound format
More than 20% unused audio at the end
Multiple or missing audio files
Too high or low audio bitrate
Too short hit sounds

Compose

Abnormal amount of slider nodes
Abnormally large spacing
Ambiguous slider intersection
Burai slider
Column usage
Concurrent hit objects
Consecutive basic-snapped hyperdashes
Contains hyperdashes
Contains hyperdashes on repeat or droplet
Disallowed hyperdash snap
Edge dashes
Higher-snapped hyperdash
Invisible sliders
Kiai inconsistencies
Missing spinner
Obscured reverse arrows
Offscreen hit objects
Pattern Lengths
Rest moments
Spinner gap too small
Spinner readability
Too high combo
Too many consecutive hyperdashes
Too short drain time
Too short long notes (less than 30ms)
Too short spinner
Unrankable finishers
Unrankable snapping
Unsnapped last note hiding barline

Design

Background offset inconsistencies

Events

Breaks only achievable through .osu editing
Storyboarded hit sounds

Files

0-byte files
Hitsound difficulty present
Issues with updating or downloading
Unused files

Hit Sounds

Hitsound inconsistency detected
Long periods without hit sounding
Low volume hit sounding
Missing custom hitnormal

Metadata

Inconsistent metadata
Incorrect format of title version markers such as (TV Size), (Game Ver.), (Extended Edit), etc
Incorrect marker format
Incorrect marker spacing
Missing GDers in tags
Missing genre/language in tags
Unicode in romanized fields

Resources

Inconsistent video offset
Inconsistent video usage
Missing background
Overlay layer usage
Too high or low background resolution
Too high sprite resolution
Too high video resolution

Settings

Abnormal difficulty settings
Default combo colours without forced skin
Inconsistent mapset id, countdown, epilepsy warning, etc
OD/HP Values too high
OD/HP values too high/low
Slider tick rates not aligning with any common beat snap divisor
Too dark or bright combo colours or slider borders

Spread

Chord too big for its difficulty
Lowest difficulty too difficult for the given drain/play time(s)
Multiple reverses on too short sliders
Object too close or far away from previous
Objects close in time not overlapping
Perfect stacks too close in time
Perfect stacks too close in time with Hard Rock applied
Too short sliders
Too short spinner time or spinner recovery time

Timing

Abnormal Slider Velocity changes on lower difficulties found
Barline is unaffected by a line very close to it
Concurrent or conflicting timing lines
Double barlines
First line toggles kiai or is inherited
Hit object is unaffected by a line very close to it
Hit objects potentially snapped to the wrong red line
Inconsistent omitted bar lines
Inconsistent or unset preview time
Inconsistent uninherited lines, meter signatures, or BPM
Invalid timing line volume
Kiai flashes
Scroll speed changes on lower difficulties
Unnormalized inherited timing lines found
Unsnapped hit objects
Unsnapped kiai
Unused timing lines
Wrongly or inconsistently snapped hit objects
Checks

/ Resources

Too high sprite resolution

Resources
General

Author: Naxess

Purpose

Preventing storyboard images from being extremely large.

Reasoning

Unlike background images, storyboard images can be used to pan, zoom, scroll, rotate, etc, so they have more lenient limits in terms of resolution, but otherwise follow the same reasoning.

Outcomes

Resolution

"file name"

Cause: A storyboard image has a width height product exceeding 17,000,000 pixels.

Resolution Animation Frame

"file name" (Animation Frame)

Cause: Same as the regular storyboard image check, except on one used in an animation.

Leaves Folder

"file name" leaves the current song folder, which shouldn't ever happen.

Cause: The file path of a storyboard image starts with two dots.

Missing

"file name" is missing, so you'll need to check that manually.

Cause: A storyboard image referenced is not present.

Exception

"file name" couldn't be checked, so you'll need to do that manually.

Cause: An exception occurred trying to parse a storyboard image.

Too high or low background resolutionToo high video resolution