Binary Sudoku. It's Only Zeros and Ones

Binary Sudoku. It's Only Zeros and Ones. From Erasable Games, a machine-readable version of the classic game of sudoku. Replace the digits 0,1,2,3,4,5,6,7,8, and 9 with their binary equivalents (1, 10, 11, 100, 101, 110, 111, 1000, and 1001), and you've got a game that even a machine can understand. I just wish that the squares were bigger...

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Four Bits is a Nibble

"The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... the binary system is used internally by virtually all modern computers. " - Wikipedia