Casino Kid is a game where you walk around a casino challenging people to either blackjack or poker.  Then you play those same games over and over ad nauseam until you win a bunch of money and beat the game.  Honestly, it's not as bad as it sounds, as the simulations of blackjack and power are quite good.  You just have to spend some time at it.  Pretty much par for the course when beating many NES games anyway.

Full Review: http://takeontheneslibrary.com/finished/133-casino-kid/