Care

This icon will light up every time your Tamagotchi needs your care.
Not answering in time will result in a care mistake.
There are two kinds of mistake: physical and mental.
The amount of mistakes will dictate the character your Tamagotchi grows into.

Type of call Expected response Type of care
0 Hungry
hearts
Give meal Physical
0 Happy
hearts
Give snack
Play
Mental
Tantrum Time out Physical
Bad mood Praise Mental
Sickness Heal Physical
Sleep Turn off the lights Mental

You get 15 minutes to answer the calls. Except the sleep one, that one gives you an hour.
The icon will turn off if you don't do it in time. You will have made a care mistake.
If you already made three mistakes during that stage, your Tamagotchi may start begging after it happens.

You can fix these mistakes by getting high scores on the games.
Getting 60 points or more on the first game will undo a mental mistake.
Getting 20 points or more on the second game will undo a physical mistake.

The guide claims some items help too, but I haven't figured out what they do exactly.

Death

Your Tamagotchi will die if:

*I heard it's 5 times, but, in my experience, it takes way more mistakes...

When the requirements are met, the Grim Gotchi will show up and take your Tamagotchi in two minutes.
If you have already lost another Tamagotchi, you will be given 30 minutes instead, so you have time to summon their spirit and have it chase the Grim Gotchi away.
You can do that by checking their grave in the notebook icon.

If you can't save your Tamagotchi, they'll die...
Press A and C at the same time to hatch a new egg and start over at the first generation.
You won't lose your items.

If you have a luxury grave, an angel (Kuriten) will come and take your Tamagotchi when they die.

👈 Notebook
Events
Tamagotchi list