Known as DS Rakubiki Jiten in Japan, any Japanese user could type in a couple different words and unlock some rather cool Easter Eggs in the software. Upon looking up the definition for the word "Nintendo," the user will be greeted with the sound of a coin from Super Mario Bros. and, even better, upon searching the term "ball" unlocks the old Game & Watch title Ball. The game is entirely played on the system's touch-screen, where the player hits left and right to keep two balls in the air.[Thanks Andy!]
