A maximum end game score of 433 could be achieved if a player started the second phase with all three lives intact and correctly answered all 40 questions.

The Fifteen to One: 433 challenge shows all of the 43 questions answered correctly by contestant Bill McKaig.
Go to http://www.quizplayers.com/w/QP:Fifteen-to-One_-_433_Challenge to see how you fare.

The Fifteen to One: 432 challenge shows all of the 46 questions answered correctly by contestant Daphne Fowler when she made the score of 432 on Fifteen to One; just one point short of the record maximum held by Bill.
Go to http://www.quizplayers.com/w/QP:Fifteen-to-One_-_432_Challenge to see how you fare.