Chosen Solution

I put a new battery in but it is still not working, so what else can I do so it can work and be played?

The mains problems with tamagotchis are : oxidized pine (if you forgot the battery in it for 20 years ago… or buy it new. usually that’s not a problem with bandaï ones, but with odd pets) you can fix it by remove the rust with a q-tip with vinegarbad contact from screen or battery . make sure the more screw you still have are well screwed. Hope it will help someone

I suggest making sure you inserted the battery in the right direction. I know this sounds like a simple thing, but someone I know did a similar mistake and ended up throwing it away when the solution was so simple.

It could also be water damaged, the circuit board could benefit from a rice treatment. If not that it could have just been its time. They are $20 dollars for a reason, they were not made to last forever.