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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.

UuultraC · Protondex

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UuultraC

#1909800

An 18+ BL visual novel set in 1970's Soshigaya. Kaiju straight out of a black-and-white TV terrorize a Japan without a world's fair. Tokyo's safety is in the hands of Sun Mask Icarus in this slapstick-yet-heavy 70's pro-wrestling kaiju drama!

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Recommendation

ProtonGreat

Only Proton reports exist so far.

Compatibility

Proton

Great

!StaleLow confidence

2 reports · Low confidence: very few recent reports yet.

NativeNone

No native Linux build — Proton only

Desktop

Great

!StaleLow confidence

2 reports · Low confidence: very few recent reports yet.

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:!Stale2 reports · last updated Jun 26, 2025

The newest report is over a year old — compatibility may have changed since.

Guide cards

No guide cards yet — curated troubleshooting for UuultraC will appear here.

Reports (2)

PathOutcomeDeviceFreshnessAnti-cheat

2 of 2 reports

GreatProtonDesktopHistorical · ProtonDB
Jun 26, 2025
Imported from ProtonDB (ODbL)
GreatProtonDesktopHistorical · ProtonDB
Mar 19, 2024
Imported from ProtonDB (ODbL)