Think 'spot the difference' puzzles are too easy? Well, look again.

Extreme Spot The Difference is more challenging, more engaging and more visually impressive than anything you've seen before. Each carefully chosen photographic scene has been cunningly modified with 50 subtle and ingenious changes. With 38 glorious images to compare, Extreme Spot The Difference is one of the most demanding puzzle books ever published. This is no throwaway puzzle to be completed in few minutes. Play alone, or with friends and family. You'll never look at a 'spot the difference' puzzle the same way again.

The book includes a unique transparent plastic Spotter's Grid to help you identify the changes and track your solutions.