Super Mario Bros. 2 was initially released on the Famicom Disk System in Japan in 1986, but was not released in North America or Europe in its original form, as you might have expected. It was instead decided that the gameplay was “too difficult” for Western gamers (and also the video games market in North America was undergoing a crash at the time), so Nintendo decided not to release it in English language territories – at least until it was later re-branded as Super Mario Bros.: The Lost levels – and released a different Super Mario Bros.2 in North America instead.