Thankfully I received it as a gift, so I didn't pay any money for it. But I did just waste a good half-hour storming the castle and never did get to the end of that level. There should be more frequent checkpoints. I know, I know, everyone else says the game is so easy, but I can't get the aim sensitivity to a level I like. I don't remember finding it difficult before when I had played it in the past, but I am having a terrible time with this level.
Here I go again...wish me luck. (the things we suffer through for gamerscore)