6 votes

From white to black

The first question is quite easy. Mirroring the board is a lot more tricky. The optional question is pretty easy again
5 votes

Smallest square that can pack thin digits

The smallest square that can contain the digits is
2 votes

Smallest square that can pack thin digits

I believe I can prove that 9x9 is The structure of this proof is: Argument to follow:
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