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Disclaimer: Don't take this too seriously, this is a little project for fun, if do you know how to code it's pretty easy to break the security of this.I agree. This looks like the problems that are easier to solve by a computer than a human, specially because the time to react is very tight, I had to try 3 or 4 times because I ran out of time.
Anyway, if this is secretly tracking the mouse movement and analyzing it for reaction time, path and other quirks, perhaps it can detect some cases.