Hi BrainBird
Thank you for that information, you also have a dedicated Nvidia graphics card.
While it is normal for your CPU to be at 100% while playing games, and this is nothing to worry about, you can probably take some of the workload off the processor.
Open the Settings App, go to System - Display
Scroll down and click Graphics Settings
Add the game to the list of apps on that page, then select the game and you can set it to run on the Nvidia card exclusively.