This is an incredible online game featuring a very admirable graphics and equally admirable concept and game play. There are as many as 4 increasingly difficult levels in the game plus a tutorial level that is put in to make gamers come at ease with the game play. You will be up with the challenge of placing towers and units to eliminate all the skeleton army trying to break into your area. The cash has to be used wisely and that is where your strategy making abilities come under the test. Upgrading is another vital activity in the game, which has to be expertly dealt with to ensure that you succeed in the endeavors.