A Fun Captcha Alternative – PlayThru
Captchas are still the standard to verify that the user performing an action (like filling forms) is a real human but not a bot.
PlayThru is a free and different alternative to other standard captcha solutions by asking users to play a very short game rather than guessing the scrambled letters (which is also like a game but “so” less fun).
The games are simply drag ‘n’ dropping items to the right places depending on the questions asked.
No Flash is used, all HTML5 and they work on mobile as well. Also, there are plugins for popular apps (like WordPress, phpBB) and libraries for various scripting languages).
PlayThru is free for unlimited use and paid plans exist for anyone that need more features and customization options.