Two of the game's four disks are labeled "Free Data Disk" and advertised on the box as "Special Edition" content. They contain the swimming and fighting disciplines.
In fact, these two bonus disks were bundled with the game from the first and never sold seperately. There was never any other than the so-called Special Edition. Whether the labeling is just a marketing gag or a relic of what were originally supposed to be add-ons remains a mystery. Add