About UltraWide
From mod.ioPlay Core Keeper at 21:9 resolution
Play Core Keeper at 21:9 resolution
Adds support for a variety of screen aspect ratios to a maximum of 21:9
Some vertical ratios like 16:10 are also covered to a certain extent
Installation
To install the mod you can either subscribe to it on mod.io or download and install it manually.
Mod.io installation
Subscribe either through website or in game [mods] tab.
This mod requires Elevated Permissions to work, such information will be prompted after game restarts with id of 5256295
If you subscribe on mod.io website, you still need to open the [mods] tab in game, for it download and install!
Updating
To update go into the game's [mods] tab, and click on the [collection] in the top of the screen. You should see the [UltraWide] mod start automatic update. After it finishes restart the game!
Manual installation
Mod.io website allows for manual file download. Unpack the downloaded file as a folder into CoreKeeper_Data\StreamingAssets\Mods inside your Core Keeper installation directory.
Updating
Follow the installation instructions.
Contribution
All feedback is welcome, if you have some ideas for improvements you can leave a comment. Likes are also welcomed ^.-
Help! The mod is not working / It's broken
Get the Player.log file from log directory.
Then share it with me with information of what's broken
No visible effect? Or maybe some graphical issues?
You can share those issues and logs with me, through one of the following channels:
- GitHub Issue at https://github.com/Sashiri/CKUltraWide/issues/new
- Discord Topic at https://discord.com/channels/851842678340845600/1420797224073429052
- Mod.IO report function, at https://mod.io/g/corekeeper/m/sashiri-ultrawide in Top Right Corner, click the flag icon and select the reason "Not working". Logs will be too large so you need to use some external file hosting to share it
- Mod.IO message
Source available at https://github.com/Sashiri/CKUltraWide
#ultrawide #ultra #wide
Highlights
From source dataGame versions
Supports 9 Core Keeper versions, the newest being 1.2.0.3.
Footprint
Rated a light load on a server.
Last update
Its author last shipped an update 8 mo ago.
UltraWide on Nxeon
From our catalogue- One-click install
- Supported on Nxeon Core Keeper servers. We download it from mod.io, place it, and restart the server.
- Server side
- Client-only: it runs in players’ own games, so it can’t be installed on a server
- Server load
- light
- Smallest plan we suggest
- Core Keeper — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
- Latest build
- 2.0, released 2026-02-25
Run UltraWide on a Core Keeper server
Pick a server or deploy a new one above; it is installed in one click.
What kind of mod it is
From the catalogCosmetics, visuals & audio
Skins, textures, shaders, models and sound — how the game looks and sounds.
Client-side mod
From source side supportmod.io lists UltraWide as not supported on servers. It runs in players’ own games, not on your server.
Compatibility
- Game
- Core Keeper
- Runs on
- Client only
- Game versions
- 1.2.0.3 and 8 earlier
Verified at the source
- ✓mod.ioOfficial listing, checked 2026-11-05Open ↗
- ✓AuthorShirai, as published on mod.io
- ✓LicenseNot published by the sourceFree
