Additional content was unlocked by scanning barcodes with Barcode Battler II connected via a "Barcode Battler II Interface".
Additional content was unlocked in the Super Famicom version by scanning barcodes with Barcode Battler II connected via a "Barcode Battler II Interface".
Within the next few years, it would also be ported to the NEC PC-9801, MSX 2, Sharp X68000, Mega Drive, Super Famicom, and TurboGrafx-16; a Dragon Slayer: The Legend of Heroes Barcode Battler card set was also released by Epoch Co. in 1992.