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You're correct. Refreshing the page a couple of times reverts the captcha to the old one with letters. So I guess they keep track of how many times they serve captchas to your ip address in an hour, and if you go over some limit they start serving you the harder captcha .

Thanks :)

That's going to end badly for 4chan, as every post requires you to fill in a captcha.

The daily routine for a 4chan poster will constitute solving that captcha 20 to 30 times.

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