A CAPTCHA for the mathematician http://random.irb.hr/signup.php and a CAPTCHA for the artist
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I've not seen this before: a captcha to distinguish adults from children! The in-app purchases were behind this screen.
The primary user is a 3 year old who can only count to 20 😊
Web forms are stateful, not tidy POST requests. I shouldn't have to fill in a CAPTCHA a second time if my input elsewhere was bad.
