Z.O.M.B.I.E. is one of many retro-styled FPS games made with the Raycasting Game Maker engine. The quality of games made with this engine varies wildly, but they all seem to share one major problem: incredibly high mouse sensitivity that can't be changed in the options menu.

I grew up playing games like Wolfenstein 3D, so I have a soft spot for titles that offer a similar experience. While looking at other Raycasting Game Maker games on Steam, I found a review that explained how to fix the mouse sensitivity. This guide will try to explain how to make these changes yourself.

Follow these steps to reduce the mouse sensitivity:

• Go to your Steam library. Right-click on Z.O.M.B.I.E., go to "Manage," and click "Browse local files."
  
• Right-click on the executable file "ZOMBIE," and select "Properties."
  
• Navigate to the Compatibility tab, and click "Change settings for all users."
  
• Enable the "Disable fullscreen optimizations" option.
  
• Click on "Change high DPI settings."
  
• Enable the "Override high DPI scaling behavior" option.
  
• Under the "Scaling performed by:" drop-down list, select "Application."
  
• Click "OK" on each window to apply the changes and close the "Properties" window.

As a bonus, here's how you enable windowed mode for Z.O.M.B.I.E.:

• Go to your Steam library. Right-click on Z.O.M.B.I.E., go to "Manage," and click "Properties."
  
• In the text box below "Launch Options," add the following: -windowed

Huge thanks to JustinceYalen for explaining how to fix the mouse sensitivity in their review of Merger 3D.