User blog comment:SRsega49/Drawn to Sonic-'Sonic in Mario'/@comment-3481843-20110523202208/@comment-2147834-20110524130531

Well, you see, Super Mario Bros.: The Lost Levels is actually the real Super Mario Bros. 2. It wasn't released in America due to it being to hard, harder than Castlevania. Eventually it was introduced to America though Super Mario All-Stars. Our Super MArio Bros. 2 is a complete rip-off of a Japanese game called "Doki Doki Panic". Hope that answers your question.