private void gameOver(boolean completed) {
		boolean beatRecord = score > highScore.get(multipleLives).get(difficulty);
		if (beatRecord) {
			highScore.get(multipleLives).put(difficulty, score);
		}
		JOptionPane.showMessageDialog(MainFrame.getThis(),
			"Congratulations!\n" +
				(!completed
					?
					"You made it to:\n" +
					"Level " + level
					:
					"You completed all available levels!\n" +
					"You must be superman or something!"
				) + 
				(beatRecord
					?
					"\n\nYou even beat the high score!\n" +
					"Most Impressive!"
					:
					""
				),
			"Game Over",
			JOptionPane.INFORMATION_MESSAGE
		);
		
		// Stop the game simply by setting it to null
		game = null;
	}