Darwin 4081

Darwin 4081
Developer: Sega Publishers: Sega (JP), Samsung (KR) Platform: Genesis Released in JP: April 7, 1990 Released in KR: 1990 This game has a hidden level select.

Level Select

In the options menu, set the sound test to 32, then press A a number of times equal to the desired level minus 1 (up to 9 presses). Start the game to go to the desired level.

(Source: Game Tricks Encyclopedia Wiki)