Start by selecting your favorite game mode from the main menu. Navigate your character using the on-screen joystick and look around with the touch screen. Find the Bone Dragon in the main challenge mode. Fire the dragon using your selected weapon by tapping the attack icon. Avoid the dragon's tail swipes by sidestepping out of the way. Pick up ammo scattered throughout the level to stay alive. Access the in-game shop between levels to buy new armor with earned currency. Progress by completing objectives to unlock higher difficulties and stronger gear.