Konami is a leading video game developer and publisher.
Konami was founded in 1969 in Osaka, Japan by Kagemasa Kozuki. Over the years Konami has created some of the biggest and most memorable video games from the vampire hunting Castlevania series through the action/shooter Contra series to the pop culture craze of Dance Dance Revolution.
Many easter eggs are hidden in NES Konami games through the mechanism of the Konami Code. During the games start phase, the player presses, quickly, Up-Up-Down-Down-Left-Right-Left-Right-B-A.
(Incomplete - Maybe the game list should have it's own page?)