Tinker Steps:Custom Proton: GE-Proton7-41
Windowing:Other
windowed mode if it exists does not work
Performance:Slight Performance Problems
still slow menu animations even though high fps
Combination Lessons and Early USSR Championships are the only 64bit Unity games from the series, whether Mangohud works on rest of the titles which are 32bit depends on your distro as some (especially Arch-derived distros) isolate 32bit packages into a separate repository that's not enabled by default. The package I was missing was lib32-mangohud