private void initializeRocks() {
		for(int i = 0; i < 250; i++) {
			Point point = getRandomLocationOnGrid(525);
			if(model.getElements().contains(new Rectangle(point.x,
					point.y, GameModel.UNIT, GameModel.UNIT))) {
				i++;
				continue;
			} else {
				model.addRock(point);
			}
		}
		int UNIT4 = GameModel.UNIT * 4;	// Should be 100 if UNIT is 25
		model.addRock(new Point(UNIT4 * 3, UNIT4 * 2));	// Below the Shop
		model.addRock(new Point(UNIT4 * 3 + GameModel.UNIT, UNIT4 * 2));
		model.addRock(new Point(UNIT4 * 3 + GameModel.UNIT * 2, UNIT4 * 2));
	}