I have wondered about this for 15 years. In early 1990 after the Wizard had further taunted me with Mario 3 but before it was released in the U.S. there was one pizza joint in my hometown that had a playchoice 10. I couldn't get there without parental transportation so I played it but twice. In this version I recall a next to impossible mini-fortress in the first world. It involved some manner of invisible staircase. Of course the mini fortress in world 1 has never been like this in any version of mario 3 I have played since. Can anyone corroborate or am I crazy?