WARNING: Are You a Human is shutting down the PlayThru service. You can read more about it here: http://blog.areyouahuman.com/goodbye_playthru
Please remove the module from your site before March 1st, 2016.
Stop spam and bots with PlayThru, the fun, free CAPTCHA alternative! CAPTCHAs infuriate users, increase drop-off, and ruin your site's experience. PlayThru is the game-based alternative that people love. It's completely free, and it could be on your site in less than five minutes.
Our games take 5 to 10 seconds to complete, versus the 12 second average of CAPTCHA. PlayThru also increases form submissions by up to 40% over other CAPTCHA options.
Our games are built in HTML5, with Flash as an automatic fallback for older browsers. And getting the game "right" isn't enough--our backend algorithms actually track how you play each game, so we even stop bots that figure out how to follow the game's instructions.
Install as usual, for further information see http://drupal.org/documentation/install/modules-themes/modules-7.
The configuration page is at Configuration -> People -> AYAH Here you can configure the AYAH module and enable challenges for the desired forms.
There are no extra module requirements for AYAH, however, an account from Are You a Human is required. http://areyouahuman.com
01/31/13 - Removed beta tag. Fixed spelling mistake in README.