Ninja Gaiden II - Save, then go down the path, get the chest next to the building entrance and go into the building. You will come to a point where there is a gap in the floor as well as a small group of black spider ninjas. You must run along the side of the wall to make it across.

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Save, then go down the path, get the chest next to the building entrance and go into the building.

You will come to a point where there is a gap in the floor as well as a small group of black spider ninjas. You must run along the side of the wall to make it across.