Mariones — 1.5
To understand Mario NES 1.5, one must first confront the anomaly of Super Mario Bros. 2 as it exists in America. Most Western players are familiar with the dream-world sequel featuring Bob-ombs, Birdo, and vegetable-pulling. However, this is a reskinned version of Yume Kōjō: Doki Doki Panic . The real Japanese sequel, known colloquially as Super Mario Bros. 2 (JPN) or "The Lost Levels," is precisely the game that fits the "1.5" descriptor.
Compared to earlier builds, 1.5 focused on stability and developer tools: MarioNES 1.5