CAPTCHA galleryCAPTCHA is an acronym for “Completely Automated Public Turing test to tell Computers and Human Apart”. In a broader sense, CAPTCHA is defined as:

Type of challenge-response test used in computing to ensure that the response is not generated by a computer. The process involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade…

[“simple” is the key word here]

CAPTCHAs present a very controversial topic: you can’t do without them as a webmaster and you can’t stand them as a user.

Some CAPTCHAs are just impossible to figure – no matter who you are (a robot or a human), you won’t pass the test. Here’s my gallery of impossible CAPTCHAs:

Read fast:

Impossible captcha: The Matrix captcha


Find cats:

Impossible captcha: find th cats

Source: Depressed Programmer

Train your imagination:

Impossible captcha: unfold the patterns


Learn other languages:

impossible captcha: international symbols


Look for the hidden code:

Impossible captcha: hidden code


Just guess:

Impossible captcha

(The second character cannot be figured I guess)


Impossible captcha: no text

(Do you see text at all?)


Know your 1-2-3:

Impossible captcha: math


Post image: Geek and Poke via Search Engine People

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  1. Captcha’s really are a pain and it certainly hurts the user experience but they are kind of a necessary evil.

  2. “Look for the hidden code:” is a parallel stereoscopic image that reads “438”, some people have difficulty with them though
    for “(Do you see text at all?)”, i see “cnzf”

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