Defend your base from attacking birds. Frighten the ravens by placing objects to scare them off. This tower defense game includes 20 levels with over 600 waves of ravens (from eggs to armored ravens), special units (shaman and doctor), 9 kinds of various devices to put ravens to flight (grenades, traps, barrages etc). Build towers, upgrade them and defend yourself against the line of creeps before they reach the end of the path.