[tyingq]

Really well done, and handled my crappy drawings just fine.

I did see the link to your thesis on captcha, but a specific higher level blog post on how this works would likely be popular.

Edit: One piece of feedback...it's hard to draw dots. You have to drag the cursor with the button down, or drag your finger in mobile to get a dot. So dots end up more like little lines. Also, an "Undo" to remove the last "cursor down / draw" event would be nice. Starting over for every line is the only current option.