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Groove Coaster modding guide

Extracting Charts

Each version uses different file extensions. Generally, AC charts are the easiest to convert into other versions.

	AC	SW	ST	APP
Chart List	stage_param.dat	stage_param.dat	TableTune.aar	???
Charts	.dat	.dat.gz	.dat	.dat (in .zip)
Audio	.wav	.wav.opus (LOPUS)	.ogg / .asn	.ogg (in .zip)
Jackets	.dds	.dds ( in .bntx)	.atx	???
Difficulty Range	v3: 1 - 10	1 - 15	1 - 15	CAS: 1 - 14
	v4: 1 - 15			AC: 1 - 20
Exclusive Songs	~171	~201	None	~48
Uses SHOT*	TRUE	FALSE	TRUE	TRUE

*SHOT is an extra audio layer along side BGM that will be temporarly muted when missing notes.

Converting Charts

NOTE: could not get AC4MAX exclusive songs to work. See song list spreadsheet. Songs listed as 4.65, 4.71, or 4.74.

Modding difficulty (easiest to hardest): AC > SW > ST

Arcade (AC)

• Arcade is rather difficult to emulate.
• Just put files in data/stage. Simple as that.

Switch (SW)

• Chart and jacket data needs to be encryped as .gz and .btnx, respectively.
• Jackets follow a different template than other versions, and need to be converted.
• Audio needs to be converted to .lopus at a slow speed. It took me around an hour per 100 songs.

Steam (ST)

• ST modding requires replacing songs, either DLC or from base game.
• Currently, you cannot replace song jackets (which contain song title)
• All data needs to be encrypted in .aar archives.
• Audio is in .ogg format, optionally encryped as .asn.

Mobile (APP)

• Have not looked into mobile modding yet.

Replacing Menu Music

	AC	SW	ST
Format	.wav	.wav.opus (LOPUS)	.ogg / .asn
Directory	data/sound	romfs/sound	Data/Bgm.aar
Menu	REBOOST_MENU	gcsw_menu	STEAM_MENU
Title	REBOOST_TITLE	gcsw_title
Result	REBOOST_RESULT	gcsw_result
Settings		gcsw_menu2

Resources

File Formats

song list spreadsheet

• Contains every song from AC, APP, ST, and SW
• Lists song names
• Lists AC and SW IDs
• Lists internal file names
• Lists Steam DLC IDs [WIP]

Mod The Coaster ♡ lemocha 2024 - 2025