We must be thinking of different lists or different mags because I know for a fact that SM was NOT #1.
My list was from the 100th issue of EGM, the one with the most famous characters in gaming all over the cover. (Sonic, Mario, Crash, Link, DK, etc.)
If SM did place somewhere on the list, I know it was definitely NOT #1. That honor went to Tetris, which makes perfect sense.
A simple, addictive puzzler, 2 players, almost infinite replay value, available on almost every gaming device out there, several versions, how could it not be #1?