The first Mario Bros. is an extension of Joust, complete with the sloppy, oversensitive controls. You kill enemies by jumping from below and then walking across them, and a all-to-rare but useful POW block. It's way better when it's played competitively so you can quarrel with which Mario brother is better. It's too rudimentary of a game for its position.
As is traditional, the NES port is easier compared to the arcade version. Atari 5200 is okay, but, boring.
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I used to blow hours on the version included with SMB3 Advanced.