The Konami Code, known in Japan as the Konami Command, is a cheat code that appears in many Konami video games, although the code also appears in some non-Konami games. The code was first used in the 1986 release of Gradius for the NES but was popularized among North American players in the NES version of Contra, for which it was also dubbed both the "Contra Code" and "30 Lives Code". During the title screen before the game demo begins, the player could press the sequence of buttons on the game controller.
The Konami Code was created by Kazuhisa Hashimoto, who was developing the home port of the 1985 arcade game Gradius, a scrolling shooter released on the Nintendo Entertainment System in 1986. Finding the game too difficult to play through during testing, he created a cheat code to give the player a full set of power-ups (normally attained gradually throughout the game). The code was present in the released Gradius after Kazuhisa forgot to remove the code. Players discovered and shared the code. It has been included in the other sequels and spin-offs, including the SNES version of Gradius III, which actually destroys the player's ship upon entering the original code.