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All user-generated content on Stack Exchange is licensed under Creative Commons with attribution required. So as long as you follow the attribution rules there, yes, you should be perfectly fine.
2
As far as I can tell, the image augments the description of the puzzle and could easily be removed. That's not to say the image should be removed, but just that the post won't be harmed much if it were. Stack Exchange sites have a clear process for handling copyright violations as explained in point 16 of the Terms of Service. Neither the moderators nor any ...
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