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Maybe it's an april fools, but the game is actually there, and it's playable.

The solution is to memorize the 4-bit sequence of each of the 16 digits, type the left nibble with your left hand and the right nibble with the right on the number row.

It takes a few minutes of practice

You have just learned how to use chmod correctly! The only difference is chmod uses octal, instead of hex.

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