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I'd guess they just make you solve an appropriate (TM) number of puzzles to absolutely certain you really are not a robot. Of course, being logged in to your g

• darkpuma 8y ago
  >"I'd guess they just make you solve an appropriate (TM) number of puzzles to absolutely certain you really are not a robot." If it were a matter of security then they wouldn't allow people with javascript disabled (which could reasonably be considered a bot-ish characteristic...) to pass through after solving a single challenge. Given how much easier the noscript version is to solve, who would make a bot that requests and solves the normal version instead of the noscript version? Any bot making a semi-serious attempt to crack their captcha will try the noscript version first. Multiple challenges aren't there for more security, they are there to get more free labor out of the human. And the tile fade-in is to punish the human for not using the web in a Google Approved™ manner.