Be aware that defense games are hard to imagine without strategy and battle elements. This game offers 21 distinct stages that you can play in the game. The game offers plenty of weapons, units and upgrades that you can use during the game play. Place the automated weapons on appropriate positions to shoot down all the approaching waves of monsters trying to advance to the edge of the grid. Bear in mind that most of the weapons attack only in the same lane. Use the mouse to control the game play.