Ultimate Ninja 5 tracks your usage stats for characters. Using a downloaded save means you will have thousands of wins for characters you never played. For purists who want their stats to reflect their actual playtime, this is a dealbreaker.
: A PAL (European) save file will not work with an NTSC (North American/Japanese) game disc, and vice versa. Always check the region before downloading.
If you are playing the digital PS2 Classic version available on the PlayStation Store (for PS3/PS4), some downloaded save files can cause conflicts with the game's "Data Install" feature, causing the game to freeze on the loading screen. Always check if the save file is flagged as "corrupt" by the system menu before booting the game.
Complete "Investigating the Darkness 1-3" to unlock the final assists and characters in Orochimaru’s Hideout. External Save Files