Everyone can see the books, but the confusing brain puzzle requires a genius to identify the hidden animal.
The latest photo shows a librarian and her cat in a cluttered library.
The busy graphic makes it easy to miss the mouse.
The creature may be easy to spot, but distractions could make it difficult.
This image will leave you scratching your brain as you rush to solve it.
How quickly you solve the riddle shows a skilled puzzler's focus and attentiveness.
In addition to sharp eyes and strong intellect, you must be calm.
Find the deadly lion stalking the park in this optical illusion to prove your intellect.
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