Super Mario Bros. 3 is the third title in the Mario series, and was released originally for the NES. Many people regard this as one of the best NES games of all time, and the Wiiviewer has reviewed the title released for the Virtual Console.
The game started off interestingly with the Wiiviewer making up the fact that people regard this game as the seond best game or the NES, with Princess Tomato in the Salad Kingdom being first. However, it was in fact later revealed that he was kidding (shocked?). He then pointed out that the game was a definite step-up from the first title, and also commented on the level design, which was shown to improve because of the Giant World.
Strangely, he actually says that the difficulty level of this game is far more brutal that the first title, Super Mario Bros., despite the fact that this game has continues. However, despite that, he says that the game is indeed one of Mario's greatest adventures, and it's worth a buy.