What stopped working:

• GzDoom (native, black screen after choosing .wad)
• Orcs Must Die 1 & 2 (proton, either doesn't launch at all, or launches with severe graphical issues such as the menu and buttons missing or the whole thing being pink and green)
• serious sam tfe, tse; painkiller black (wine via either bottles or pol, extreme speedup every 5 seconds)
• luxor 3 (bottles, crashes on launch)
• hotline miami 2 (proton, crash on launch)
• lego indy 2 (bottles, sound effects at 150% loudness)

most of these worked previously, but seemingly broke out of nowhere, unless driver or kernel updates wrecked thwm, but if that is the case i haven't the faintest clue on how to troubleshoot that besides trying every previous kernel i can still download.

Device: Legion 5-15, 16gb ram, radeon 5 4600, nvidia rtx 3060 mobile, newest version of mint and newest LTS kernel. LUKS partition. I'll add more info when i get home.

So, tl;dr:

• how to troubleshoot proton games
• how to troubleshoot wine games in bottles and pol
• how to prevent games breaking out of nowhere in the future