Binary joke

[JugglingReferee]

Originally Posted by CoachP

I know, I know, ....10 + 10 = 100


But I'm missing the Suduko bit. You're not allowed to repeat the same number within a grid in Suduko. So....???

Sudoku uses a 9x9 grid with 9 different symbols (digits).

The puzzle-joke is a bit of a stretch because Sudoku only uses the non-zero decimal digits. The non-zero decimal digits in binary consists of only the digit 1. That means that the only possible Sudoku puzzle in binary is a 1x1 grid - a single box, populated with the digit 1.

However, geeks being what they are, trying to show the world that they do have a sense of humour, invented the binary Sudoku puzzle, where both the 0 and 1 are used. Therefore, you can now have a 2x2 grid. Using 1 and 0, there are only two possible grids:

╔═══╦═══╗ ╔═══╦═══╗
║ 0 ║ 1 ║ ║ 1 ║ 0 ║
╠═══╬═══╣ ╠═══╬═══╣
║ 1 ║ 0 ║ ║ 0 ║ 1 ║
╚═══╩═══╝ ╚═══╩═══╝

All one needs is any one digit from the the entire puzzle to know the rest of the solution. So the joke is that there is only two solutions, and you that only need to know one digit in the whole thing to solve it all, and that the newbie version gives you two digits, and the expert version only gives you one digit, but they have the same solution, even though they gave the opposite type of digit to start with.