Hi Alex,
I'm not sure how the Book game is supposed to work, I just know how to fix the problem.
I've checked for an explanation on how to use the module but the best I can find is here: https://moodle.org/mod/forum/discuss.php?d=132026&parent=577993
I think we need someone to expand step 2 and explain it in much greater detail with very explicit instructions.
cheers,
Derek