John Sikela does the art as Mr. Mxyztplk returns, in Action 112 (Sept. 47).
The 5th Dimensional imp comes back to Metrolpolis, but finds his usual mayhem not as interesting. Superman attempts to reason with him, suggesting he do something less destructive to occupy his mind, like playing chess. This spurs Mxyztplk into creating a life sized chess game.
One of the most entertaining bits of this story deals with two men inside the castle that Mxyztplk takes for his set. Although they get flown across the ocean, the men continue having tea, unconcerned and unaware of what is going on.
Lots of good art, and a fun story, ending with a special piece that Superman adds to his side of the board. A Klptzyxm!