Anyway, I built it in a way so I could easily create future volumes when inspired with new sequences for people to solve. Similar to Mercy, you only get once chance after you've completed the game. Scores would be pointless if you could retry since the answers would already be known.
Some suggestions from players that I'll integrate into future iterations of the game would be to lower the cost of the hint and to have it automatically unlock after a certain number of wrong answers.
Related Link: Brain Numbers - Volume I on Shen Games