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The modern compatibility index for Steam games on Linux.

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Protondex is an independent community compatibility index and is not affiliated with Valve, Steam, Proton, CodeWeavers, or ProtonDB.

Some historical compatibility records originate from ProtonDB's data export under the Open Database License (ODbL) v1.0; Protondex publishes a periodic public dump of its compatibility database under the same license. View the ODbL.

Kumitantei: Old-School Slaughter · Protondex

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Kumitantei: Old-School Slaughter

#2759280

Kill each other...for science! The class of '89 is trapped in an elite school killing game. Investigate, solve, and expose your classmates in Kumitantei™: Old-School Slaughter, an episodic murder-mystery ADV card-battler inspired by retro anime.

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Recommendation

ProtonGreat

Only Proton reports exist so far.

Compatibility

Proton

Great

✓CurrentMedium confidence

3 reports · Medium confidence: more recent reports would firm this up.

NativeNone

No native Linux build — Proton only

Desktop

Great

✓CurrentMedium confidence

3 reports · Medium confidence: more recent reports would firm this up.

HandheldUnknown

No reports yet

Anti-cheatUnknown

No anti-cheat reports yet

Summary based mostly on historical data from ProtonDB. Fresh reports from your setup help keep it current.

Freshness:✓Current3 reports · last updated May 6, 2026

Guide cards

No guide cards yet — curated troubleshooting for Kumitantei: Old-School Slaughter will appear here.

Reports (3)

PathOutcomeDeviceFreshnessAnti-cheat

3 of 3 reports

GreatProtonDesktopHistorical · ProtonDB
May 6, 2026
Imported from ProtonDB (ODbL)
GreatProtonDesktopHistorical · ProtonDB
May 5, 2026
Imported from ProtonDB (ODbL)
GreatProtonDesktopHistorical · ProtonDB
May 3, 2026
Imported from ProtonDB (ODbL)