The Adventures of Bayou Billy (NES / Famicom)

Sometimes I wonder how I even managed to play some of the games of my youth.  When I was a kid, I played the hell out of Bayou Billy, and even managed to finish the game.  However, coming back to the game as an adult I realize that it's actually really tough.  Even the first level is handing my backside to me on a regular basis.  It's games like these that really show me how challenging games on the upper end of the difficulty scale can be.