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Given its age, MarioNES 1.5 lacks the modern user interfaces and extensive feature sets of current emulators like Installation

Critical fixes to internal mappers ensured that complex games like Super Mario Bros. 3 and Metroid functioned perfectly without the graphical or logic glitches found in earlier builds.

The release of MarioNES v1.5 focused on fixing underlying issues that plagued earlier versions. Key improvements included: