Ya it's the Konami Code. There is a sign that says it but instead of Left, Right, Left, Right, B, A it's Left, Left, Right, Right, B, A. Maybe meant to throw you off?
As some of you might know a VN called A Dragon Girl Looks Up at the Endless Sky came out on steam. I have had a good time with the game until I came to the Ghost City maze and I have no idea how to get though it. If anyone has beaten this game and willing to tell me that would be great thanks.