Which did you like more? I found the US version of Mario 2 actually pretty awesome. I do realize it wasn't originally a Mario game, and it's pretty funny how the Japanese had to baby up Mario for us because they thought the Lost Levels were a bit too hard... but I actually enjoyed Mario 2 a lot more than the Lost Levels. Maybe it was the difference in scenery. I mean besides the next gen Mario games it was the only Mario game to have things like flying carpets. Plus it introduced the Shy Guys which have stuck around for other Mario games. Not to mention it seems to me that Yoshi/Birdo type characters were a byproduct of Super Mario Bros. 2. Not to mention Toad. My vote goes to the US version, a.k.a. Super Mario Bros. 2, because I think it really helped to shape the Mario series. I also think it was a lot more fun than the other Mario titles for NES.