Clair Obscur: Expedition 33 — Steam Launch Options

10 community-verified launch options for Clair Obscur: Expedition 33 on Steam ↗.

DeveloperSandfall Interactive

PublisherKepler Interactive

Released2025-04-24

EngineUnreal Engine

-sm4

Forces Shader Model 4 (DirectX 10). Significant performance improvement in UE games.

Epic Games Documentation
✅ Verified
-windowed

Run the game in windowed mode instead of fullscreen

manual_curation
✅ Verified
mangohud

Proton/Wine compatibility option.

ProtonDB
-dx11

Force DirectX 11 rendering

manual_curation
✅ Verified
-dx12

Force DirectX 12 rendering

manual_curation
✅ Verified
-vulkan

Use Vulkan renderer

manual_curation
✅ Verified
-fullscreen

Force fullscreen mode on startup

manual_curation
✅ Verified
gamemode

Proton/Wine compatibility option.

ProtonDB
-USEALLAVAILABLECORES

Uses all available CPU cores in Unreal Engine games.

Epic Games Documentation
✅ Verified
-malloc=system

Use system memory allocator for better performance

Unreal Engine