So, with the Heroic Challenges - to do all 26 you need all 26 characters, right? Sorry if that is a really silly question. If that is the case, it is a pretty ingenious mechanic as to upgrade your characters the most you will need to get every character. For instance, since I have 11 characters each character could only do 11 challenges, right?
I caved and ordered the Pirate adventure pack from Amazon. I also could make an excuse to go to Wal-Mart later but I really, really shouldn't. My wife does not approve of my hobby :).