Add option to force users to answer correctly before moving forward

[jewlofthelotus]

Not yet sure how to handle correct / incorrect error messaging yet... If they submit and their attempt is wrong - do we have a custom try again message? do they get the incorrect message with a "try again" (back) button? do they get an alert popup? (ew)

http://wordpress.org/support/topic/force-correct-answer?replies=1

Maybe the incorrect message appears below the answers, instead of the current switch out that happens when an answer is false. Then they just have to change their answer and click the button again.