As of today (October 19th, 2018), Nimonix issued a client patch supporting 1024x768 screen resolution support. You can now toggle this on the in-game Settings. The new resolutions are : 1024 x 768 (Non-wide, Square) 720p [also known as : 1280 x 720] (Wide mode) 1680 x 945 (Even wider mode) 1080p [also known as : 1920 x 1080] (Ultra wide mode) Update 01/21/2019 : This fix will not work if your computer's screen resolution is below 1024x768. However, the issue was that the game would STILL not launch because your client is still on the same resolution (which is probably 720p (Registry Editor value : 6 [for Resolution & ScreenRes]) You will need to manually change the value in the Registry Editor (regedit.exe) to launch the game on 1024x768 resolution. Steps : Open Start Menu and type in regedit.exe (open as Administrator preferred). Scroll down the Registry main folder : HKEY_CURRENT_USER and double click it. A new set of folders will be shown. Locate the folder named "Software" and double click it. You will see another set of folders, locate the folder named "Nimonix" and double click it. There will be a folder that shows up as "RumbleFighter". Double click it. You will see a whole bunch of registry files. Locate the "Resolution" and "ScreenRes" registries. Double click it and change the value data of both registries to "9". Your client should run at 1024x768. ADDITIONAL OPTIONAL STEP (Also applies to first time downloaders) : If your client was full screen and trying the above did not resolve your issue, you must also change the registry of "Windowed" from "0" to "1". Disclaimer Registry Editing is done at your own risk. A missing or incorrect value data can negatively affect your game client. If you are having trouble understanding to perform the steps above, ask in this thread.