The old version of Super Mario Bros. Crossover was too complicated with its fancy graphics and sound, so we ported it to Atari. Since Atari has less memory than Nintendo, we took out some of the characters. I think you’ll like this new version of SMBC much better. I know I do.
Edit: This was an April Fools joke. You can play with the atari skin in the current version of Super Mario Bros. Crossover.