In "Sonic the Hedgehog 2" for the Sega Genesis, what do you input in the sound test screen to access the secret level select?

In Sonic the Hedgehog 2 for the Sega Genesis, the input required in the sound test screen to access the secret level select is the Lead Programmer's birthday. The reason behind this choice is likely a creative decision made by the game developers as a way to pay tribute or give recognition to the lead programmer's contribution to the game. It could also be seen as a hidden Easter egg or inside joke within the game, adding an element of fun and exclusivity for players who are aware of this secret code.