The SNES Lemmings US version has a few different places from a Japanese version. Now, important matter is not how hima got US version Lemmings. Important matter is search a different place from Japanese version.
Since only a different portion from Japanese version is explained, first of all, please study the Japanese version perfectly. I think that you cannot understand except this page even if it translates into English simply. Because other pages require the background of Japanese cultural knowledge. Your loves to Japan is a shortcut to understand this page.
