public void addRock(int x, int y, int size) {
	if ((size <= 3) && (size > 0)) {
	    for (int i = 0; i < size; i++) {
		for (int j = 0; j < size; j++) {
		    if ((y+j<this.ourMap.length) && (x+i<this.ourMap[j].length)) {
			this.ourMap[y+j][x+i] = new Tile(2);
		    }
		}
	    }
	}
    }