Can we reach back and press the degauss button on the back of someone else's monitor?

I had to think of https://pixelripped.com/. I see this was actually an inspiration!

Funny. At my HS there was also a game where you'd hang out in the drafting lab during lunch, and try to eat your lunch food while playing Wolfenstein 3D, without the teacher noticing the food part.

Crumbs on the digitizer board were especially dangerous to your wellbeing.

Our "hidden" game was one called Conflict where you were Israel.

I managed to load it on the shared hardrive (20 Meg, I think).

Ours was Spectre[0] as our school had a Macintosh lab. We learned to pick locks on that lab door, to sneak in and play the game together during lunch. Thankfully the lab teacher was an extremely passionate nerd like us, so was understanding, but it still involved a fair few lunchtime detentions over the year or two we did it.

[0] https://en.wikipedia.org/wiki/Spectre_(video_game)

Is that this one?

https://en.wikipedia.org/wiki/Conflict:_Middle_East_Politica...

Looks pretty intriguing!

Yep, that was it

That was Lode Runner for me in school :)