Has anyone actually tested this? Giving them as many chances as they like is a really bad idea. I tested this by trying to click every image but the correct one. Before i got to the last image i was varified before clicking the correct one.
I think the only reason this is effective is because bots don't know of this mod yet and is probably just as effective as asking a question in plain text.
So my advice is to fix the bug i mentioned and give them one chance to answer correctly, then block them from trying for an hour, then if they fail again block them completely. But even then it can be cracked with chance.
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