Am having difficulty getting the 'sliding numbers' puzzle to work correctly in the surface of th diamond mine. Can get the first two exchanges, but when it comes to moving the three black over, I can't do it. Any suggestions? Thanks in advance.

You just need to keep alternating colors. Start with one black one, moving it to the right. The black ones always go right. This leaves space for two white ones to go to the left. The white ones always go left.

Remember, they can jump.