Woooo! Its cooool!
I want it.
How do that?
Just use patching feature but there is no revert from it. Use NFC on your smartphone. You are stuck with Doom. So emulate this Tamagotchi on computer first. But how to play Doom on it:
A - switch guns
B - shoot
C - game menu
But when you press and hold them, you move.
A - left
B - forward
C - right.
Not really, someone has decided to recall the Tamagotchi, or still toy of this class in demand?
It's almost dead in 2017 but if it can run CS 1.6 (best competitive shooter of all time), then it will be popular. It's underpriced if it will run Half-Life. Now I try to install Quake 1 on second Tamagotchi 4U. If it runs, then it's amazing how far technology came in. Maybe I will figure out how to overwrite EEPROM with custom ROM installed.
Edit: I won't help no one how to install it or CPU specification because I don't want to have problems. But you can port C here and compile it here.