Index
Checks listing
Audio
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
Slider only section
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
Files
Hit Sounds
Hit sounds referenced without the file being present
Inconsistent hit sounds between difficulties
Inconsistent hit sounds between difficulties
Long periods without hit sounding
Low volume hit sounding
Missing custom hitnormal
Silent hit sounds not using the 44-byte blank.wav
The same sample played multiple times at once
Metadata
Resources
Settings
Abnormal difficulty settings
Default combo colours without forced skin
Difficulty settings outside of the guideline range
Difficulty settings outside of the guideline range
Illogical base SV progression
Inconsistent mapset id, countdown, epilepsy warning, etc
OD/HP Values too high
OD/HP values too high/low
Score/Combo overflow
Slider tick rates not aligning with any common beat snap divisor
Too dark or bright combo colours or slider borders
Skinning
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
Close barlines
Concurrent or conflicting timing lines
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
Index
Checks listing
Audio
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
Slider only section
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
Files
Hit Sounds
Hit sounds referenced without the file being present
Inconsistent hit sounds between difficulties
Inconsistent hit sounds between difficulties
Long periods without hit sounding
Low volume hit sounding
Missing custom hitnormal
Silent hit sounds not using the 44-byte blank.wav
The same sample played multiple times at once
Metadata
Resources
Settings
Abnormal difficulty settings
Default combo colours without forced skin
Difficulty settings outside of the guideline range
Difficulty settings outside of the guideline range
Illogical base SV progression
Inconsistent mapset id, countdown, epilepsy warning, etc
OD/HP Values too high
OD/HP values too high/low
Score/Combo overflow
Slider tick rates not aligning with any common beat snap divisor
Too dark or bright combo colours or slider borders
Skinning
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
Close barlines
Concurrent or conflicting timing lines
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
/ Files
Empty difficulty file
Files
General
Beta
Author: Greaper
Purpose
Ensuring every .osu file in the song folder is a valid, complete difficulty.
Reasoning
A .osu file with no content at all is not a usable difficulty; it has no metadata, no hit objects, and cannot be loaded by the game.
Outcomes
Empty
"path" is empty.
Cause: A .osu file in the song folder contains no data.