Leo tapped the D-pad, navigating the flickering Japanese menus. For weeks, they had been grinding the "Slot Machine" system—the game's notorious method for unlocking content. They had endured countless matches just to earn enough tickets for a spin, praying for the rare character silhouettes to align.

You can find reliable save files at the following archives. You will need to search these sites for "Battle Stadium D.O.N":

Clear game on Normal (Unlocks Hard) -> Hard (Unlocks Very Hard) Are you trying to

The GameCube version of Battle Stadium D.O.N uses 59-block saves on memory cards. Despite identical gameplay, the data structures are entirely different (GameCube uses a proprietary Nintendo format). No cross-platform save transfer was ever supported, disappointing some players who owned both consoles.

I fixed it turns out you had to create the save data manually in the options menu in the game itself. Reddit·r/PCSX2 Battle Stadium D.O.N - Resources - Speedrun.com