private void checkGameIsSolved() {
if (board.isSolved() == false) {
return;
}
// clear UNDO stack
steps.clear();
// stop the timer
pauseTimer();
// stop showing combination list
combinationView.update(new Group(Group.NON_ID));
// prevent user input
boardView.setOnKeyPressed(null);
// congratulate user
boardView.congratulate();
// pop up alert
AlertFactory.createInfo("SUCCESS", null, "Congratulation! You are genius!").showAndWait();
}
