Where's Waldo? is an NES game based on the popular series of books, where your goal is to find Waldo in various pictures in order to progress through the game. This is easier said than done thanks to tiny sprites, a usually-limited color palette, and Waldo sometimes being in colors other than his usual look.
At the copyright text screen, press Up + Left + A + B + Select, then Down + Right + A + B + Start. This special screen will appear.
Track 4 on the NSF is a short, looping tune that isn't heard in-game. This song was most likely supposed to be used as a pause tune, as Wayne Gretzky Hockey plays the same song when you pause the game. However, Where's Waldo? does not have an option to pause the game.