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I say it's not too difficult because you can use tricks to dispose of your enemies, the easiest being concentrating on the ones with the lowest counts first and if they have healing tactics, save the power pil's for the final takedown of the general. Also, with the high amounts of exploration required to get the treasure chests, you'll gain several levels off-quest. This is one of the games in which a level or two really comes a long way. The only part that I've only made it past once was that big Sima Yi thunder spell - mostly because it wasn't until I had the game for like 8 years that I was able to get that far, and by then, my controllers were more or less broken.