Click on the tabs on the bottom during the game to switch from troop,infantry,traps, and shop menus. To place something on the screen, simply drag and drop. When you click on something you want to a buy a description and price will appear in the menu in the top right hand corner. When your ready to start hit the battle button. You can sell a tower by holding "s" and clicking on a tower.

Defend your ship from the oncoming hordes. Purchase turrets and lay traps on your way to victory.