I wouldn't take a chance to sneak it in because you could get caught. If you have a brother or sister or friend from another school they ccould babysit it and then you wouldn't have to pause it. But if you dont trust anyone except yourself with your tamagotchi, pause it by pressing A & B. It wont age as fast but you don't want it to die or get taken away! LuV yA~ZeLdA~
If you have a Connexion, you can pause it by going to the clock screen and leaving it in "set" mode. You can always keep it paused in your backpack and check it between classes or at lunch.
I sneek mine in to school and know one knows. I play it ONLY in My Home room. THe people who sit next to me dont care cause they do stuff to when the teachers not looking!
MUTE = hold the A & C buttons together and select sound off. to get sound back then just hold the A & C buttons again and select on. (A is the far left and C is the far right button)
PAUSE = hold the A button then press the B button. (A is far left and B is middle button) and do un-pause just do the same thing.