Strictly speaking, throwing hidden weapons cannot be considered a complete form of Martial Arts but rather a technique for exerting force. Therefore, there are no Master Level hidden weapons or Grandmaster Level hidden weapons in the system. Instead, some martial arts techniques include methods for using hidden weapons, like the Shaolin Plum Blossom Darts and the Shaolin Flying Knife, found in Shaolin Fist techniques.
After exchanging for so many Martial Arts techniques, Wu naturally knew how to use hidden weapons, having even practiced them specially. Otherwise, when he had thrown daggers and dinner knives in the past, his technique wouldn't have been so fierce or accurate.
But compared to Fist techniques, Wu couldn't really say he excelled in hidden weapons, it was just that relying on sufficient Explosive Power and fairly good accuracy, he had managed to avoid making mistakes with them in the past.
