My new AMD graphics card wasn't doing the do on Linux Mint. A powerful computer struggling to run a ten year old game is not good.
So, I learned how to check drivers on Linux. Then, I downloaded a new kernel. Rebooted, made a Timeshift (back up image of the entire drive in case of drama), created a new folder and, in Terminal, found the .git repository for the amdgpu drivers.
Downloaded and pointed the to right folders, a quick preference tweak, another reboot, and now I'm running super a fancy game at 120 fps.
Just call me Scipt-Kiddy Book!