Little Killer

It is admittedly harder to explain how Sudoku doesn’t actually have anything to do with arithmetic when there are variants like this one which do. And this one has a lot of arithmetic.

In Japan the puzzles (not this one) are “Samunamupure” but a UK newspaper decided adding arithmetic to Sudoku made it a “killer,” and the “Killer Sudoku” name stuck. We call them “Killer Cages” three decades later. No cages in this puzzle, but each tiny arrow defines a “virtual cage,” so it’s a “Little Killer” puzzle. I don’t choose the names!