OK, so I did this unit this week. Really, really great game. My coteacher LOVED it too. I changed it a bit. I made all the textbook questions to where there was no multiple choice, but they had to answer in a complete sentence. I then went around and looked over the sentences, helped them make corrections, etc. They then read these to to the class. I also made all of the '100" short answer, with no multiple choice. I just had them give me the response. This worked well as most of them already know the answers to those.
I highly recommend this game, regardless of the book anyone is using. My girls just loved it. Thanks again :)