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I love math – I mean, I had to, given I went through at least two math subjects every semester when I was still in college. That said, I enjoy solving the occasional Sudoku puzzle or two when I have the time to spare.
This has got to by my favorite Nixie tube creation in a very long time – a fully-playable Soduku board.
Trashbear Labs built this Nixie Soduku board using 81 individual tubes, arranged into a grid, and controlled by a couple of dials and a keypad.