"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
Success doesn't necessarily come from breakthrough innovation but from flawless execution. A great strategy alone won't win a game or a battle the win comes from basic blocking and tackling.