Most NES games had "cheat" methodologies for game testing purposes, which made it into production cartridges. For Top Gun, you could bypass fighting anything on

Most NES games had "cheat" methodologies for game testing purposes, which made it into production cartridges. For Top Gun, you could bypass fighting anything on EVERY level, by flying up and to the left for the duration of the combat. I only knew a few of these tricks. In Parappa the Rappa, there were various patterns that would essentially complete every level with various outcomes, regardless of the actual songs.