As you go deeper and deeper into the tunnel you finally see a huge open space with many stars sparkling with a deceptive gleam. A metallic ball is bouncing around in the expanse. In the entrance to the expanse it says "Hit the ball of H.Turt to continue...all else is error."
You see a bow and arrow in front of you which you pick up. In your spirit you know you have to hit the ball of H.Turt to continue your quest.
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