Mario is going to war with Bowser on the sea. Defense your castle against Bowser invasion. Send Bowser home using you super smart bomb to sink Browser navy.
Try to build and grow your bonfire. As you progress through the game, your bonfire will grow bigger and bigger until it reaches to a galactic proportion.
Fight an infection present in human body. The first battle takes place in the nose. All towers produce units slowly over time. To get more units, you need to claim more towers and make them your own. Take over all enemy bases to complete each level.