Super Mario Bros. Special is a Japan-only, unauthorized port of Nintendo’s Super Mario Bros. created for NEC’s PC-8801 (PC-88) family in the mid-1980s. It’s notable as an early PC-era adaptation that diverges from the Famicom/NES original in level design, mechanics, graphics, and music, and it’s become a curiosity for retro-game historians, ROM collectors, speedrunners, and preservationists.