Aztec Adventure

Aztec Adventure
Also known as: Nazca '88: The Golden Road to Paradise (JP) Developer: Sega Publishers: Sega (US/JP/EU), Tec Toy (BR) Platform: Sega Master System Released in JP: September 20, 1987 Released in US: 1988 Released in EU: 1988 Released in BR: 1988 This game has a hidden sound test. This game has a hidden level select.

Sound Test

At the screen before the start of the game, press Left once and Right 20 times. Select "00" to exit.

Level Select

At the title screen, press Up 5 times before the scroll opens, then press Right 3 times when Nino (red hatted character) tosses money at everyone else, then press Left as the characters walk off the screen. The level number will appear next to the title. Toggle it with Up and Down and start the game to go to the chosen level.

(Source: GameFAQs (Vegetaman))