(Here‘s my adjusted version too in case that helps :)

I had the same problem (running Fedora 38), and this post really helped me - it goes through the whole MOK generation/enrollment and then provided a script to automatically sign the modules. I had to make a couple of adjustments to make it work on my system and to automatically load the modules with modprobe , but now I just run /sbin/vboxconfig; /root/bin/sign-vbox-modules each time my kernel gets updated and can use VBox fine again.

Maybe Antichamber? It‘s a first-person puzzle game like Portal, but based on the idea of the „rooms“ changing as you go through them, so each room basically has its own mechanic to figure out

Sadly not as AFAIK you need to be connected to the same network as the device (at least on iOS)