Postby Julia Pseudo » Sun Sep 21, 2014 3:03 pm
If your son want to play the original Super Mario Bros., you can download it on the Wii Virtual Console for the equivalent of USD $5. Otherwise, you're probably going to want to go with New Super Mario Bros. Wii, a "traditional" Mario platformer on the Wii.
By the way, the original Super Mario Bros. is probably the second hardest game in the series after its sequel, Lost Levels, so you've got nothing to worry about in terms of difficulty.