CAPTCHAs don't work. At least for humans. It's fairly easy to write a script with current technology even for an average "hacker" to solve them. But on the other hand it's extremely hard, nearly impossible for a person with special needs to complete them. Even for average person solving some of CAPTCHAs is a hassle. Most of the popular CAPTCHAs services are "robot-friendly" and providers don't care who solves them, t…
A particular gaming forum uses game covers and asks users to select the correct title. This is quick enough to decipher for a human, while any OCR bots would have a difficult time with it. They could build a database of all covers, but it would be difficult to keep it up to date, and site owners could simply add more variation, so I doubt any bot authors bother to do so.