No, I understand that. In the spirit of the thread though, you wanted advice on how to make you code better, not advice on making things work. Making things work is simple. Making things work elegantly is a different story.

Which is why I will reiterate, whether it is overkill or not, instead of having a single handler for the game you should really modulate the work and give each piece it's own handler. Simon should have a handler, the UI should have a handler, and the player should have a handler. Designing it this way allows for easy extensibility in the future when you want to add more features that will ultimately require multi-threading support.