This type of challenge allows the classification of images.

A key word and nine images are displayed:

  • three images that correspond to the keyword
  • four images that do not match the keyword
  • two images for which we do not know the answer

The order of the images is random.

To validate the captcha, the user must select all the images that match the keyword and not select the images that do not match. If the user selects the two unknown images, they will be annotated with the corresponding keyword.

Captcha for classifications

From this challenge you can access the audio captcha to allow visually impaired people to respond.