The next puzzle in this series is a Kakuro, possibly one of the most controversial genres in the list. Kakuro is already a polarizing genre -- extending its size to 15x15 makes it even more so.
The Nikoli style of Kakuro is very different from the style of Kakuro often seen on puzzle contests. These puzzles focus more on Kakuro as a crossword genre rather than a mathematical genre. More emphasis is placed on common number patterns and crossword logic; arithmetic is often kept to a minimum. I tried my best to replicate this style in this puzzle, and I think I succeeded for the most part.
I personally believe that these puzzles are easiest to solve on paper; having eyes on the entire board at once (and, in particular, having smaller cells overall) feels better to me. Thus, I've attached a PDF version of the puzzle closer to Nikoli's style. I recommend printing this out to solve, but Penpa and puzz.link options are also here as usual. The numbers were a pain in the butt to format; I'm probably not doing this again. Nikoli, please don't sue me for forgery. 😛
(A picture of the puzzle is hidden from the main feed for file size considerations.)