Start up the game, and before the title screen press these buttons quickly. Up, Right, Down, Down, Down, Down, Down, Down, Down, Down, Down, Left, Left, Left, Left ...
When the NES dominated the video game marketplace, it came in several packages with ten different games and a variety of accessories.
Press and hold Select, then press Reset. While holding Select, immediately after the copyright screen appears, quickly press A, B, Up, Down, Left, Right, A, B. The secret credits message will appear ...