These are great puzzles but it's not great in an ebook format. My rating is on the content, not the format.

I like how these puzzles are organized into 3 sections of 30 puzzles. They go from 30 easy to 30 difficult. The 90 puzzles are arranged in an order to help you over 90 days with improving your logical thinking.

I love logic books and this one got progressively harder which was nice. My only issue is that it was an ebook. I normally prefer physical books for logic puzzles and being able to have everything one page is easier when doing an ebook. Love sudoku! I also love that it had both sudoku and logic puzzles. Great for a plane or long car trip!

I appreciate that there is an answer key and a explanation on how to use but the format makes it hard to use I ill try this on my laptop but it does not open well currently in kindle app and that makes it hard to try to use. The grids are missing that are referenced making it hard the play the games.