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Stonehenge Is Going Nowhere
Age 14 to 16
Challenge Level 
Like Stonehenge 1, this is an exercise in having a feel for
mechanics.
One way to think about this one is that when you push the stone from left to right, the top layer of logs wants to move clockwise, and from left to right. The bottom layer of logs then wants to move anti-clockwise, and from right to left. However the bottom layer cannot move left since the logs on the top layer are going right.
One way to think about this one is that when you push the stone from left to right, the top layer of logs wants to move clockwise, and from left to right. The bottom layer of logs then wants to move anti-clockwise, and from right to left. However the bottom layer cannot move left since the logs on the top layer are going right.