I have been playing in the calm lands for an hour and every game is rigged I tell you!
you only win like, 1 out of 60 times!
Other than that, this game is the shiznit (one of the best games on Playstation 2).
Oh, and the two you can unlock in Chapter 5 for raising raising the PR ranks. Those actually have some pretty good strategy, particularly the monkey one where you have to feed it fruits of various sizes and try to keep the weight from going too low or too high. I got really good at that.
I have to warn you, there is swearing
and if you liked that, watch the second one at http://egoraptor.webmoron.net/flashff72.html