How to play Needle and Haystack
Solve the Search Challenge using your best thinking and the clues provided. Clues must be deciphered and do not necessarily make good keywords. Each time an incorrect answer is entered, another clue is provided and a point is deducted.
Points indicate the difficulty level of the Challenge.
Since ancient times, walls like the Great Wall of China have been built to thwart intruders
They aren't always effective
What WALL is the first known strategic failure?