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This is a great puzzle which shows how our minds can be conditioned by problems that get increasingly difficult.

We'd love to know who designed this puzzle and built the PowerPoint file. If you know, please email us so we can give the designer full credit.

You'll enjoy this

(Note: This puzzle is in a PowerPoint file. You can download Microsoft's PowerPoint reader here.)

Just click on the image below to download the PowerPoint file, and follow the instructions.

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The first few images for this puzzle are displayed quickly and it's worth using pause/restart keys ('S' or '+' on your keyboard) to advance the slides at your own pace.

Mental challenge

We'd love to know who designed this puzzle. If you know, please email us so we can give the designer full credit.

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