I almost called this one 159 Sandwiches, because my creativity had run out for the day. Then I thought, wait, that’s a ridiculous number of sandwiches. So I changed the name, because really, 159 would be a ridiculous number of sandwiches. Either far too many, or one too few. But 159 combined with Sandwich Sums, well, that’s a different story entirely.

I’ve made a few references to 67 in puzzles, including just a couple of puzzles ago. I’m doing it again. 67 67 67. Why not? Sometimes you see a waveform-like shape and a need for a couple of given digits, so why pick them at random when 67 are right there? Note: This is puzzle 100 for 2026, numbered as I created them.

Bonus puzzle! SudokuBank is brand-new, just two days old, and has a lot of appeal for both puzzle setters and puzzle solvers. I was invited to set a puzzle for the launch, and this is the result. As a setter, SudokuBank includes many constraints for which I normally would use custom code, like “Ambiguous Kropki Dots,” which are new to the blog. Each dot is either a white or black Kropki dot, but which? That’s up to you to determine!

Very repetitious. Seven cells of nine. Very repetitious. Same pattern many times. When I don’t tell you what song I’m thinking of, and also change the lyrics, I assume it doesn’t make much sense at all.

I’m not singing, but somewhere, out there, beneath the pale moonlight, there are arrows and thermometers to fill the grid. Try to place all of the digits without flipping your lid. Somewhere, out there, there’s no 6 nor 7. Out where dreams come true.

I don’t think of fog as something that echoes. If an empty room filled with fog, I think shouting would end up swallowed, the sound absorbed and reflected by the fog rather than bouncing off far walls. I don’t actually know, and if I looked for answers on the internet, what would I write about here? If you know the answer, shout it into the void, and perhaps it will reach me.

I’ve solved more than 1200 computer-generated Killer Sudoku puzzles on a daily site, but there’s a definite sameness to them. Just having some cages without totals makes these puzzles different, and I enjoy each one as much as a dozen on the daily site. I would say that, though, wouldn’t I?

Tea Time might make you think it’s another Battenberg puzzle, but no, this one is about sandwiches. Or Sandwich Sums. I’ve decided that they’re tea sandwiches. Or tea Sandwich Sums? Let’s stick with tea sandwiches. Perhaps cucumber, or egg and cress, or egg salad. I haven’t done sandwich puzzles before, and it turns out they’re fun!

Global Entropy rules affect every 2x2 groups of cells. Quadruples affect some 2x2 groups of cells. What happens in those 2x2 groups of cells in which Quadruples are pushing one way while entropy pushes in another? That’s the question posed by this puzzle.

The most fun thing about these little arrows is how many cells they affect. All of these arrows form 5-cell or 7-cell virtual cages, more or less. These things are so long that even though they’re on opposite sides of the puzzle, they still have cells in common! Every single line arrow overlaps with at least two other arrows, believe it or not.