Okay, we're a little late in covering this one;  Hack A Day and Engadget beat us to it.  This is a 81-Nixie tube based Sudoku board which appears to use IN-12's (based on the upside down 2 used as a 5.)  There are two knobs on the board, one controls the x position and the other controls the y position of the cursor.  The number pad controls the actual value of the input. Be sure to visit the site - he graciously includes the source code and schematics.


Nixie Sudoku




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