The cover art
Super Mario Bros. is the first shame that was ever invented. It was made by Mr. Nintendo and Shigeru Miyamoto when they made the Nintendo Entertainment System, and its knockoff the Famicom. It is the most successful of every shame ever sold by Anybody that has ever existed ever. Of all time. Super Mario Bros. can be played on any Nintendo shaming system, and several others as well.
Mr. Nintendo and Shigeru Miyamoto were trying to think of ideas for the first shame ever. That's when Miyamoto's future self appeared from nowhere. He said to make a shame about this guy called Mario. They did, and it was a huge success. Now it seems that half of the shames in the world have something to do with Mario.
The shame has really poor graphics, but Nobody seems to mind because this shame is simply so awesome. The only person who had anything negative to say about this shame was Luigi, and he's stupid.
The Famicom coverart. Notice that it puts WAY more emphasis into enemies and the fact that Bowser is grey