Choose the size of the grid, and one or four grids per page. Press New for another puzzle, then print it. Every killer sudoku has exactly one solution, found by logic alone.
Version 1. Last updated on Sun, 25 Oct 2026.
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Eight classic 9x9 killer sudoku puzzles, one grid per page: an empty grid, the digits 1 to 9, and some forty dotted cages with their sums. For solvers who already enjoy regular sudoku, with a book of all eight.
Eight 6x6 killer sudoku puzzles, one grid per page, with the digits 1 to 6 and cage sums as the only clues: the step between the 4x4 starter grids and the classic 9x9, with a book of all eight.
Eight 4x4 killer sudoku puzzles, one large grid per page, where the only clues are the cage sums. The gentlest way into killer sudoku, with a book of all eight pages.
Printable killer sudoku puzzles in three sizes: 4x4, 6x6 and 9x9 grids split into cages, each with the sum of its digits, and no digit given. You can print one grid per page or four of the same size. Every puzzle has exactly one solution, and its answer key shows every digit.
Killer sudoku follows the rules of sudoku: each row, each column and each box holds every digit exactly once. But no digit is given: the grid is split into cages, outlined with dots, and the small number in the corner of each cage is the sum of its digits. A digit never repeats inside a cage. You start with the smallest cages, list the digits that can make each sum, and cross out the ones that do not fit. Killer sudoku combines the logic of sudoku with addition practice, and trains planning ahead and checking your work.
Every killer sudoku has exactly one solution, checked by the generator, and it can be solved by logic alone, without guessing. The cages have two to four cells on the 4x4 and 6x6 grids, and two or three cells on the 9x9 grid; a cage of a single cell gives its digit. The page is made in your browser: nothing is sent to Zuzuzi, and it is free, with no sign-up.