This is a Sudoku puzzle.
(Click for larger size)
Long-time readers might remember the days when puzzle 50n+49 was always some sort of silly joke, with 199 probably being the best example. At first appearance, this might look like a continuation of that, but it isn’t. I did just in fact post a classic Sudoku. Actually I’ve made a few of these already as part of improving my solving. This is the first one that I even considered publishing.
As a final note, the difficulty is probably a little off from Friday. This one is probably around a nikoli Hard, which is more typical for Wednesday on this blog. My reasoning is that classic Sudoku tend to have a difficulty ceiling before guessing becomes the best strategy, and a typical Friday of mine would easily break that threshold.