Also, is there a utility I can use to stealth my calculator to prevent being busted by teachers?  I am in desperate need.

You shouldn't  be playing game in class when you should be working. There are ways to do what you want, it just wouldn't work well if at all with what you want to do it with.
Also, this question should have gone in it's own thread.

What do you mean? MirageOS has an interrupt (i think it's [ON]+[MODE]) that quits directly to the homescreen, though depending on how large the program is (and if it's in archive) it might take a couple seconds to do that. There's also [ON]+[CLEAR] to directly quit the program to the MirageOS shell main menu. Or did you want something that hides your programs (a fake reset) so that your teacher thinks you have nothing on there?

And just a personal opinion: If you want to pay attention or not in class is up to you. If you think you shouldn't play games in class that's fine, but personally i don't see anything wrong or immoral about it. The worst that will happen is that your grades drop, and that's a personal decision I played games all through middle school and high school and don't regret it one bit. The value of a high school class is pretty subjective, besides.

As for other games, there are tons of amazing games out there. Mario was always a lot of fun, and before that, Sqrxz, Phoenix (the classic), or even Phantom Star (a sort of spiced-up Phoenix), Pacman, Amidar which is like Pacman but i think more fun (it has some extra features like jumping), James Vernon's new Alien Breed 5 (or even version 3 or 4, for that matter), etc. There are plenty of great games!

Wait they don't let you play games during lunch break?

Also prgm hiding tools can be bypassed by teachers who know about them, since those programs have been around for years. They won't stop the teacher from performing a full mem reset as well. But it sucks that teachers won't even let you do what you want during lunch break. You should complain at the school administration since lunch break == your own free time.

I'm not sure it's up to date for the MP OSes though.

well, lots of people (such as myself) would argue with you that OS 2.43 is better for math as well, because pretty print is annoying and slow and the entire MP OS series is riddled with bugs.

as for finding another program of that sort on the internet, if brandonw is the only person people know of here who's made one, it's not likely that another exists (beyond a "display a fake RAM cleared picture" program).

the VAT is the Variable Access Table. it's a spot in RAM that the OS uses to store the locations of programs, appvars, strings, etcetera. if something screws up the VAT then it could very easily lead to losing those things.

I tried sending os 2.43 to my calc, but it failed.  Now my calculator has no os.  Whenver I try downloading os it gets to validation and then error: turn on to turn unit off, then turn back on.  What do I do.  I am about to try on another computer (hasn't been used in years.)