Thanks for another great year of puzzles! I especially liked Dec 9. I didn't figure out an elegant way to calculate the answer all at once (is there a way like this?), but I did it in a spreadsheet, where I figured out how to have each cell calculate whether it'd be on the line. It was satisfying to see the grid filled with 0's and 1's, with the 1's carving a nice path from corner to corner.
on /blog/120