Are you playing on the original PS2 hardware or are you using the PCSX2 emulator ?
Because the slot machine is widely considered tedious or "cheating" by adjusting its timing, many players prefer downloading pre-made save files. battle stadium don ps2 save data
Battle Stadium D.O.N PlayStation 2 , save data is primarily managed through standard 8MB Memory Cards . Because the game was a Japan-exclusive Are you playing on the original PS2 hardware