The developers decided to leave it there, as removing it could result in new bugs and glitches. The code was meant to be removed prior to publishing, but this was overlooked and only discovered as the game was being prepared for mass production.

After entering the sequence using the controller when the game was paused the player received all available power-ups. Finding the game too difficult to play through during testing, he created the cheat code, which gives the player a full set of power-ups (normally attained gradually throughout the game). The Konami Code was created by Kazuhisa Hashimoto, who was developing the home port of the 1985 arcade game Gradius for the NES. The code has been used to help non-expert players to progress through the game. The code is also known as the 'Contra Code' and '30 Lives Code', since the code provided the player 30 extra lives in Contra. The Konami Code was first used in the release of Gradius (1986), a scrolling shooter for the NES and was popularized among North American players in the NES version of Contra. The code has also found a place in popular culture as a reference to the third generation of video game consoles, and is present as an Easter egg in a number of websites. ↑ ↑ ↓ ↓ ← → ← → B A sometimes Start or Select is added to the sequence (usually to start single player or two player modes). In the original code, the player has to press the following sequence of buttons on the game controller to enable a cheat or other effects:

The Konami Code ( Japanese: コナミコマンド, Konami Komando, 'Konami command'), also commonly referred to as the Contra Code and sometimes the 30 Lives code, is a cheat code that appears in many Konami video games, as well as some non-Konami games. ( Learn how and when to remove this template message) JSTOR ( July 2023) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.

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