Hmm.. that does sound like a bug. You mean Chapters 1 through 22 are all hidden or something, or do you mean Chapters 24 and 25 are hidden? In the latter's case, getting to the end of Chapter 23 will unlock Chapter 24, which will unlock 25.
As for the minigame: apparently the design is much more confusing than I thought! Here's a hint that I think will help: you can select more than one word from each column. Just select all the words that apply. :)