You are being attacked by a horde of monsters and you must do the Konami code to survive! Konami code: Up, up, down, down, left, right, left, right, B, A, start. Zero is equivalent to start. There are two ways to trigger the easter egg.
Edit 1: Fixed up some stuff and added a thumbnail. Edit 2: Added the monsters. Edit 3: Added this edit log. Edit 4: Minor bug fixes. Edit 5: Added a beautiful easter egg.