Vs. Super Mario Bros. (set SM4-4 E) ROM

One alternate version, Vs. Super Mario Bros., is nearly a separate game in its own right. This game, one of several games made for Nintendo's NES-based arcade cabinet, the Nintendo Vs. Unisystem (and its variant, the Nintendo Vs. Dualsystem), is based on Super Mario Bros., and has an identical format. The stages, however, are different; the early stages are subtly different, with small differences like the omission of 1-up mushrooms or other hidden items, narrower platforms and more dangerous enemies, but later stages are changed entirely. These changes have a net effect of making Vs. Super Mario Bros. much more difficult than the original Super Mario Bros. Many of these later, changed stages reappeared in the Japanese Super Mario Bros. 2. As with many older arcade games, it is unclear exactly when this game was released; while the arcade boards themselves are stamped "1985", the Killer List of Video Games, the title screen, and the MAME game listing list the game as having been released in 1986.