Stage select code
When you start the game, you can press on the second player controller to instantly advance to the next numerical world at any time, or you can press on the second controller to pause the action of the game.
Secret ending message
During the ending, a baby Kong will appear on the screen and give you the peace sign. At this time, press and hold + throughout the entire staff credits roll, and wait for the final screen to appear. If you held the buttons down, a secret message will appear and depending on how many hours it took you to beat the game, you'll get 24 different messages.