Super Mario All-Stars
Nintendo originally released a different game called "Super Mario Bros. 2" on Japan's Family Computer Disk System in 1986 (later released as "" for Super NES as part of Super Mario All-Stars). Its engine is that of an enhanced "Super Mario Bros.", with the same basic game format but adding more complex level designs, character features, and weather features. Some of the advanced level content had been culled from "Vs. Super Mario Bros.", a 1986 coin-operated arcade version of the original "Super Mario Bros." for NES. All of these factors combined to yield an incremental game design with significantly higher difficulty.