Tamagotchi Friends has two shades, how is it done programmatically?

Question

Java

https://www.youtube.com/watch?v=75LOwvAit0o

here are the developments: Can you explain how the drawings and animations are encoded in the Tamagotchi hexadecimal code?

Answer 1

Programmatically made 3 colors.
I think these are some bits on the screen in 3 different states.