The code works only on Liquid Easy, Naked Normal and Solid Normal difficulty levels. The code needs to be entered each time the player looks at the map viewer. In Metal Gear Solid 4: Guns of the Patriots, inputting the Konami Code in the map viewer when fighting Crying Wolf, will show her location. After clearing the game, inputting the code on the game cleared screen will have Snake remark "One More to Go."
Inputting the Konami Code upon starting the game will likewise result in the opening credits being changed to the opening title credits, which features the people who created the opening. Also, if the player interrogates EVA in Zaozyorje, she will at one point mention the first eight inputs of the Konami Code. In Metal Gear Solid 3: Snake Eater, inputting the Konami Code will allow the player to see The End on the map during the boss fight with him. In-universe, the Konami Code was physically represented with Solid Snake and Otacon's handshake.Īlthough not actually part of the Metal Gear series, Evolution Skateboarding, which featured Snake, Raiden, and two Gurlukovich soldiers as unlockable skins, nonetheless included a variation of the code for unlocking all stages, although in this case, the "B" and "A" is replaced with "Down" and "Up". The expansion pack, Metal Gear Solid 2: Substance, features a similar use to the one above, as well as an additional use where, if the player registers their save file name in Missions mode as "UUDDLRLRBA," the player will unlock all missions and characters. In Metal Gear Solid 2: Sons of Liberty, the player can input the Konami Code shortly after clearing the game, when the clear code is on display, after which Snake will be heard either saying "What do you think you're doing!?" or "STOP FOOLIN' AROUND KID!" as confirmation of the code, although it can only be used once. The code was popularized in the NES version of Contra.
During testing, Hashimoto found the game to be too difficult to complete, so he put in the code which gave the player a full set of power-ups. The Konami Code was created by the late Kazuhisa Hashimoto while porting the arcade game Gradius over to the Nintendo Entertainment System.