Because there was never an official retail release for the PS1, finding a clean ISO is considered a "holy grail" for collectors of unlicensed software. This "exclusivity" isn't about a store bonus—it's about the rarity of the data itself. Why is it so hard to find?
The PS1 version is unique as it represents a part of the console's "underground" history. Being an unlicensed port from an unknown developer, it often features minor differences in difficulty or presentation when compared to the official Sega Saturn and 3DO versions. Due to its status, original physical copies are considered quite rare among collectors. yakyuken special ps1 download iso exclusive
To download the Yakyuken Special PS1 ISO exclusively: Because there was never an official retail release