Puzzle Description:

(This puzzle was recovered from the 2016 database crash. Description not available.)

#1: Jota (jota) on Jan 29, 2021       classify

Ninja?

I think it is the nib of a pen, writing a line.

There is one tricky part at the beginning. The key for me was the four in c9; some deep lookahead first eliminated r1c9, and then r2c9. Once those two were dots, the rest of the puzzle was easy.

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