After centuries of peace and isolation, the Sky Fortress of the Whistle Knights has been found. It's up to you to defend against the invading forces of mankind, with only your bow to help. Buy and level up unique and devestating weapons, combine them in any way you like to create your own custom powers, deploy cunning defensive upgrades - the tactical possibilities are endless. Use YOUR MOUSE to click and hold bow, drag to draw and release to let loose your arrow. Good luck!