On: McDonald's just dropped a brand new Game Boy game

[londons_explore]

It's in the game, but the console famously checks that the code for the logo is present, and refuses to run any game which doesn't have the code in place.

It was used as a way to prevent anyone unauthorized making games. If you copy the logo, you have violated trademark and copyright law, and if you don't copy the logo, your game won't run.

Detail here: https://catskull.net/gameboy-boot-screen-logo.html

[ant6n → londons_explore]

If I remember correctly, the ROM gets read once to check, and then again to display. One could use some circuitry to deliver another logo on the second read.

[londons_explore → ant6n]

Also, a court struck down this approach to locking a console from playing third party games anyway.

That's why all modern consoles use digital signatures.