[elliottcarlson]

After testing alternate versions of the three successes (to see if those were based on luck), only two remain to be successful; Changing "The 2nd colour in purple, yellow, arm, white and blue is?" to "The 2nd colour in purple, arm, yellow, house, white and blue is?" causes the question to fail.

[joelvh]

Good point. That gives a good indicator as to how the algorithm works. Not necessarily based on colors, but rather words in a list...? Maybe the construction of Text CAPTCHA sentences needs to be chosen carefully when thinking like an algorithm....