3. Up, Up, Down, Down, Left, Right, Left, Right, B, A.
This happens to be the famous Konami Code, but which game could it be found in?
From Quiz Once a Cheater, Always a Cheater
Answer:
Contra
Made famous by old-school gamers, the Konami Code showed up in some of the company's most popular video games. In the eighties, it debuted in the 1985 shooter "Gladius", during which the game could be paused and the code used to gain power-ups. Most popularly, the code appeared during "Contra", an NES game from 1987 that gave the player thirty lives when the code was given in the title screen. Games have continued to be made with the code as the years have gone by, many of which weren't even developed by Konami. Because of its integration into gamer culture, the Konami Code has been and homage in more games than almost any other cheat.