With that boss I didn't had much trouble in the timing. Maladus from ST, however is another story. Hardly lost any life points with that guy and life points lost are easy recovered. The timing on hitting those fireballs was a pain. There is always one of the last ones that got through and I could start over again. The spirit pipes song that you need to play is the hardest song. All the previous songs in the game I did without any problems, but this one was long and needed a real precise timing. The fight took me hours to win but the only problem I had with this fight was the battery ran out and I had to connect the DS to a power outlet. Not really a frustrating fight, but tiring nonetheless.