Konami Code Secret Screen
This easter egg can only be seen on the 3DS version, and only the full version (not the demo).
The Konami Code is a recurring video game easter egg created by video game developer Konami as a cheat code for the 1986 video game, Gradius for NES. It is now used by many developers to unlock cool, fun and outrageous features, screens and areas in their games.
At the title screen players can enter the Konami Code (up, up, down, down, left, right, left, right, B, A) to access a secret screen.
After inputting the code correctly, the screen will immediately change to a pixelated man dancing while a voice sings “Secret screen” in the background.