masked_nybbles
*alleged sandwich
You likely can just interpret it however you like. I doubt the purpose of this exercise is to follow the prompt to the letter. But then, I am not the author of the prompt.
Not sure, but does it meet the any legal definitions of a sandwich anywhere — as in it can be advertised or sold as a sandwich?
I'm not sure what my favourite is, but Screen Cheat, of which may be found on Steam, can be fun. The gimmick is that it is a local split-screen shooter in which it is practically required to look at others' screen to know where they are as everyone is invisible otherwise, aside from projectiles.
I don't play games with much frequency, but I play on some combination of Steam Deck and a desktop running OpenSUSE Tumbleweed, a Linux distro.
Edits/Changes: Forgot to specify Tumbleweed.