Review: HD better than black and white.
Rating: 4 out of 5
Date: 02 15, 2013
I used the iphone.  Having the color was way better than the Black and White version. I didn't feel eye strain.  Color also helped in seeing suttle differences in a few puzzles and did help finding the answer.Since it was on the iPhone, small screen and all, sometimes a few links were on the next page versus right below the puzzle(possible answers, or the "next puzzle" links).  I wasn't going to change the font size to fix this, since it's so easy to simply swipe my finger on the screen and get to the next page to click those links.As with the previous puzzle ebooks from the family, when you get the wrong answer, it tells you :(.  You can go back and try again.  When you get the right answer, it explains why it was right.Very fun.  Definitely gives me something to work my brain since they get harder as you go.  Fun to do while you wait for something like you doctors appt or a bus.