Keep in mind that non-hardenized containers only protect you from bugs, they don’t protect you from sophisticated malware. If you suspect the software you are trying to run might be a virus, don’t run it, or run it in a virtual machine.
I would recommend using containers only if you absolutely understand how to make them secure AND you have no reason to suspect the software you are running might contain nefarious code. In any other case use a virtual machine.
Yeah, I realize that and that’s a nuisance for a videogame… If the game is small enough, OP might be able to give it a virtual GPU with VirtualBox, I did it in the past to play with friends on a single computer. I don’t know if the usual KVM-based VMs support it as well.