This book is a challenge in concentration as you try to discern all of the six differences in the two images on the page. Finding the first four is generally pretty easy; it is the last two that are difficult. Fortunately, after you solve a few, the solutions are easier to find as your eyes and brain become accustomed to the nature of the problem. I found the puzzles enjoyably frustrating and groaned many times when I was unable to find the last alteration and went to the solution and realized how obvious it should have been.
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