Print killer sudoku with clear dashed cages and corner sums, 9x9, 6x6 or 4x4, one, two or four per page, with answers. Print the combinations table too if you like to solve away from a screen.
What a page looks like
A puzzle as it printsIts answer, on the last page
Printing tips
Write a cage's possible digits in tiny numbers along its edge, not in its cells: the cells stay free for candidates.
Which size to print
A 9x9 killer prints best one per page: the cage sums sit in the corners and candidates need room. The 6x6 and 4x4 boards fit two or four to a page and make a good classroom lesson in cage sums.
Using the answer key
The answer shows the full grid without the cages. Check one house at a time: a row that adds up to 45 with no repeats is right as a whole, so look for the error where a cage crosses into the next box.