1. Download and install the free HxD hex editor from here, be sure to select the newer version that supports Windows 10 (it will work on Windows 11 as well): https://mh-nexus.de/en/hxd/

2. Open up File Explorer and navigate to this path: C:\Program Files (x86)\Steam\steamapps\common\SonicRacingCrossWorlds\UNION\Binaries\Win64

- Remember to replace "C" with whatever drive letter your Steam library or game install is on if it isn't on your primary drive.

3. Make a copy of the "SonicRacingCrossWorldsSteam" file. Rename the original file; the idea is that we're going to edit the copy you made to support ultrawide while keeping the original file so that we still have it just in case something goes wrong. You can rename the original to something like "SonicRacingCrossWorldsSteam-Original" or whatever else you'd like.

4. Rename the COPY that you made "SonicRacingCrossWorldsSteam" - this is necessary so that the Steam client will recognize the game properly.

5. Open this file in HxD (use HxD64 if you have a choice between this and HxD32).

6. Click "Search" on the top menu bar, then "Replace..."

7. Click the "Hex-values" tab. (Be sure to do this, as if you stay in the "Text-string" tab, the next steps won't work!)

8. Enter 398EE33F in the "Search for:" box.

9. What you will enter in the "Replace with:" box depends on exactly what your monitor's native resolution is. Steps 9-12 will modify the game to run at your ultrawide's native resolution SINGLE-PLAYER mode (multiplayer is covered a few steps down).

- If your monitor is 2560x1080 or 5120x2160, enter 26B41740

- If your monitor is 3440x1440, enter 8EE31840

- If your monitor is 3840x1600, enter 9A991940

- If your monitor is 5120x1440 (a super ultrawide), enter 398E6340

10. Select "All" under "Search direction".

11. Click "Replace all."

12. Click OK.

13. Now, it's time to modify the game to run in ultrawide when doing two-player split-screen. Repeat steps 9-12, but with different values:

- Enter 398E633F in the "Search for:" box (note that this is only one character different from the single-player step - it's not the same value so don't copy and paste the value from that step).

In the "Replace with:" box:

- If your monitor is 2560x1080 or 5120x2160, enter 26B4973F

- If your monitor is 3440x1440, enter 8EE3983F

- If your monitor is 3840x1600, enter 9A99993F

- If your monitor is 5120x1440 (a super ultrawide), enter 398EE33F (you'll notice this is the same as the original single-player value; this is because two-player split-screen on this monitor size is essentially the same as having two normal 16:9 screens next to each other)

14. Save the file by clicking the floppy disk icon in the toolbar, then close HxD.

15. When you start the game, be sure that the game is set to run at your monitor's native resolution. From the game's main menu, select Extras > Options > Graphics Settings > Resolution.

That's it - enjoy!