You have the only money-growing tree in existence and the other ghouls are jealous! Shoot wave after wave of ghouls to earn money that you can use to upgrade your gun or purchase turrets. Turrets placed on the bottom of the playing field will fire at air enemies and turrets placed on the top will fire at ground enemies. Try to collect the rings that appear in random spots on the playing field. If you collect three rings in a row without being hit by enemy, you will earn twice the money for each kill for a limited time. In addition to staying alive, your goal is to complete all 30 tasks. If you do die, you won't lose any of your completed tasks.