Mercs Glitch/Corrupted Save Data

On the PS2 Version of Playgrounds of Destruction, saving the same playthrough in different slots can result in corrupted Save data appearing in the memory card, saving in the same slot for an entire playthrough can have the same result. For this sole reason, never save on the same slot for one playthrough, and do a backup of your save file, or you might lose your data.

It's unknown if saving in different slots only in different sessions or if you can play multiple characters in different slots without turning the game off is save, it is recommended to avoid "testing" this glitch if you lack a means to delete corrupted Save Data off your memory card.