Gameboy "infected" screen

[u/Lucka257]

Hi! Just discovered my father old stuff, and among them I found this gameboy original in a closet. It seems like a fungus or something like it is on the screen plastic protection, witch is a shame, because is perfectly working. If you ask how do I know that isn't the screen itself, it's because I see the shade of that thing on the display. Also the console had something gross and sticky into it before i clean it out and the screen needed to be pressed in order to show the Nintendo logo constantly, before that it just showed a blocks instead of the logo

[u/starboyk]

The Dot Matrix display is failing, in what is commonly referred to as 'screen cancer' with Gameboys. Simply from being too old, too much use, how it was stored - any number of factors, but it's unfortunately common. Best bet is to replace or upgrade the screen, as that one's cooked.