Hi

People are still making this, and talking to the last person to make it on a photo PCB,
an error has been found int he schematic (might not apply to PCBs made in CAD).

The schematics in the package show the wring pic pin for one of the buttons.
It’s actually the pin that drives the lone LED, so should have been found by anyone proficient actually making it.

With the error, the display will constantly show “Tetris”, and stay there no matter what buttons are pressed.
It’s waiting for the button that was held at power to start Tetris, to be released (and that never happens).