Hi everyone.
As a fellow Steamdeck player, me & the community tested various ways to Run Inzoi the best on Steamdeck LCD/OLED.
We started from a black screen, to playing it for hours with none or very less problems.
Waiting for Inzoi’s developers official fix for Steamdeck, these are all the fixes that we found working.

Inzoi Community Steamdeck’s topic

UPDATE: Tested Inzoi working on Steamdeck with CAHAYA DLC!

Leave your comment, thumbs up and favorite if this helped ❤️!
Thank you!❤️

-IF you’re having problems with a blackscreen and Inzoi not launching, run Inzoi with Proton Experimental. You will see this will help the game have its first run.

-IF you don’t have this problem, skip this step.

HOW TO RESIZE GAME WINDOW NOT LAUNCHING FULLSCREEN & mouse issue:

This is a common issue with some games, as we have to change resolution to windowed fullscreen to make it run fullscreen.
Follow these steps, it’s very fast and easy:

GO TO DESKTOP MODE

• Open home folder
  
• Right corner> Show hidden files
  
• Follow this path: .steam/steam/steamapps/compactdata/2456740 (this is Inzoi’s game folder)/pfx/drive_c/users/steamuser/AppData/Local/BlueClient/Saved/Config/Windows
  
• Open GameUserSettings.ini
  
• Look for Fullscreenmode=0
  
• Change the 0 to 1 as Fullscreenmode=1
  
• Save

Go back to Game Mode, and it’s on fullscreen now.

*In the game settings, don’t change Windowed Fullscreen to Fullscreen as it will change the line back to 0, making it windowed again.
For visual explanation, see Deck Wizard’s video linked below.

After some testing, we found out the game runs way better using Proton g.e. !
I used to play it with Proton Experimental experiencing many crashing issues.
Changing to Proton g.e. resolved these issues, as I’m having no crashes at all after hours of playing.
Proton g.e. is used to run Windows games more stable when you have crashes or issue with the game not working well.
It’s very simple, follow these steps:

-ENTER DESKTOP MODE (Steam>On/Off>Desktop mode)
-Click the DISCOVER page
-Search for proton
-Install ProtonUp-Qt
-Launch
-Add version
-The latest version should be selected already, press Install
-Wait for it to be installed, then Close
-GO BACK TO GAME MODE
-INZOI>Properties>Compatibility>Force the use of a specific Steam Play compatibility tool>
G.E. Proton

You successfully did it!❤️

We found a pretty self-explanatory video that helped us a lot.
This is to manage the in-game graphics settings making the game run better, and less heavy on the console.
I’m linking the video, thanks so much to DECK WIZARD for the help!
Follow his steps.
or here (link)

*These settings will help the game run smoother as it takes away a bit of the heavyness from the game, even without Proton g.e. But I definitely suggest installing that version of Proton as you can still experience crashes or freezing often.

This is optional as not many are able to do this, it needs some tweaking with the game folder and files. You have to create a .ini file and this will be used to ENHANCE the game graphic’s settings on Steamdeck with less performance decrease.
Thanks a lot to ORB for helping & creating these lines for the .ini file

• Follow this path to reach the game folder:

"~/Steam/steamapps/compatdata/2456740/pfx/drive_c/user s/steamuser/AppData/Local/BlueClient/Saved/Config/Windows’’

• Create > Blank file
  
• Open it with KATE, rename the file Engine.ini
  
• Copy these lines and adjust how you feel it’s more suitable for you

[SystemSettings]
r.MotionBlur.Max=0
r.MotionBlurQuality=0
r.DefaultFeature.MotionBlur=0
r.DepthOfFieldQuality=0
r.SceneColorFringe.Max=0
r.SceneColorFringeQuality=0
r.DefaultFeature.Bloom=0
r.BloomQuality=0
r.LensFlareQuality=0
r.DefaultFeature.LensFlare=0
r.Shaders.FastMath=1
r.Shaders.Optimize=1
r.Streaming.Boost=2
r.GTSyncType=1
r.OneFrameThreadLag=1
r.TemporalAA.Algorithm=1
r.TemporalAA.Upsampling=1
r.TemporalAACatmullRom=1
r.TemporalAAFilterSize=1.5
r.TemporalAAPauseCorrect=1
r.TemporalAASamples=5
r.TemporalAASharpness=1.5
r.MaxAnisotropy=16
r.Tonemapper.Quality=1
r.ToneMapper.Sharpen=1.5
r.Tonemapper.GrainQuantization=1
r.ToneMapperFilm=0
r.VolumetricFog=1
r.LocalExposure=1
r.Color.Grading=1
r.Color.Min=0.00
r.Color.Mid=0.50
r.Color.Max=1.00
r.SkylightIntensityMultiplier=0.50
r.ExposureOffset=1.0

• Check it as “View only”. If it’s not checked, the game will remove this file having write rights on
  
• Save. Adjust whenever you feel

If not needed anymore, just delete the file.

INCREASING VRAM USAGE - UMA FRAME BUFFER SIZE NEW!

I’ve been testing this for some weeks, as today (May 6) I noticed a significant increase on the game performances as It doesn’t crash anymore and it runs no problem with Medium graphics, when I had issues even running it on the lowest settings before this adjustments.
You have to access Steamdeck’s BIOS so I recommend it to advanced users, but it’s a pretty easy operation and it’s reversible by just going back to the BIOS and select the default setting again.
Nevertheless, every BIOS update will bring the vram back to default.
If the game is not running well I would suggest to give this a try.

If you look up Inzoi’s performance on Steamdeck, you’ll notice the game has quite a big Ram usage on the hardware as a requirement.
The console is set to use only a few percentage of the vram (virtual ram), on default is set like this cause it doesn’t require much hardware usage unless you play AAA titles or very heavy games, like this one.
Increasing VRAM usage will make the console less “fatigued” while playing a title like Inzoi, which only performs well on heavy machines.
Steamdeck can be tweaked to use way more vram in the BIOS settings, that’s what we’re going to do to make it less heavy on the hardware which will become more powerful having the capabilities to do so. This increases performance on the machine as well even when playing other titles.
Note that this will help run the Inzoi game, search on your discretions if you want to proceed.

Update (August): The game is working fine even with ray tracing on and medium graphic settings. No crashes. My vram usage is currently back to default (1GB).

-To increase VRAM usage, follow these steps:

With the console off, start holding the volume up + button and press the power on button.
When the Steamdeck logo appears, release the volume up + button.

• Select “Setup Utility”
  
• Go to “Advanced” and select UMA Frame buffer Size
  
• Set UMA fb size as you’d like, from 256MB to max 4GB
  (The default setting is 1GB/1,024MB)
  
• Select “Save and Exit”
  (Choose Yes if you see the “Exit Saving Changes” dialog).

Done! Do your researches about Steamdeck’s vram usage to choose your preferred UMA fb size.
I set mine to 2GB.
*After some console updates, my vram usage is back to 1GB as of August 2025.

The value is changeable with the same process.
Hope this helps!

On 20th August, Inzoi released the CAHAYA DLC.
The CAHAYA DLC is working fine on Steamdeck too! With all the fixes above.
FYI I’m playing with my old save and everything seems to be there, be sure to always backup your saves. The DLC is best played with a new save as Developers state.

DEMO VIDEO (PLAYING INZOI ON STEAMDECK)

Or here Inzoi video demo 2 link (Youtube)
I’m playing with a paired bluetooth mouse, the game is working smoothly.
Steamdeck LCD 512gb, Medium graphics & ray tracing on.
In this video, I changed one of my Zoi’s appearance, and got her Zoi sister to a walk thru the Temple area in Dowon. Took some photos, had some chats & eat. She came back home and used her computer, while I managed to see what her family was doing in the other house across the neighborhood.

Or here Inzoi video demo link (Youtube)
Excuse the bad quality of this video, Here I was playing the game just after the DLC got released and filming single handed was not easy.
During this video, my Zoi travelled to Bliss Bay from Dowon. I was looking for places to visit, she went to the Bliss Bay amusement park, had a chat, swim & snorkeling.