I've mentioned my obsession with Sudokus before, I think, (and I'm hoping for a snow day so I can do one ... haven't had time for a while), but as we wait to see whether today is going to be declared a snow day, the incipit of piece from the Star suggests:

THE root of Sudoku lies in an 18th century brainteaser called Latin Squares invented by a mathematician named Leonhard Euler who hails from Basle, Switzerland.

Further surfing suggests Euler Squares (as they are also known) might also be called Graeco-Latin squares. But, alas, it appears that name arises from a practice of using Greek and Latin letters in alternate squares when figuring it out.

... we'll find something Classical about these eventually (perhaps a tie to SATOR-AREPO things) ...