The ROMs ain't as good as playin' the real games. For instance, worse sound quality and no way to use a Zapper. Also, the driving stages are messed up in the Bayou Billy ROM (though they're fine in the Mad City ROM). But the ROMs are all right. You can also use the Game Genie codes on the NES ROM. Download and enjoy!
NES
The Adventures of Bayou Billy
game ending
Famicom