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Comments in green were written by me. Comments in blue were not written by me.
 2024-12-25 
Could I have some help with puzzle 23. I don't see anything about a 3×3 block. How to arrive at a formula for the number of squares that need colouring?
Reza
on /blog/111
               
 2024-12-25 
@Reza: I think he reworded it. As for how to solve it, I didn't find a formula or anything. I just basically used his 5x5 example and extrapolated it. It's much less complex than you think it'll be.
Seth Cohen
on /blog/111
   ×1            
 2024-12-27 
@Seth Cohen: Thanks Seth, I solved it by looking at the 5×5 picture and thinking harder. Thanks to Matthew for another enjoyable set of puzzles. I look forward to reading the proper solution.
Reza
on /blog/111
               

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