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Best killer sudoku sites

The useful killer sudoku sites are not the ones with the most puzzles on the homepage. They are the ones that can tell you a puzzle has one solution, that you can reach it without guessing, and that “hard” means a specific kind of step rather than “we deleted more digits.”

A fair site checks uniqueness with a solver that is independent of the one that builds the puzzle, then rates the puzzle by the techniques a person actually uses: combinations, the 45 rule, innies and outies, pairs, and cage splits. A site that only counts how many digits it gave you is grading a different game. Classic sudoku can lean on givens. Killer sudoku is mostly cages, and on the harder sets there are no givens at all.

The second thing worth demanding is a combination table you can filter, plus a way to print. Teachers, puzzle clubs, and anyone playing on paper need the sums written down, not trapped in a script. An embeddable daily puzzle is the same idea for blogs and community sites: the board travels, the credit stays attached.

We built iLoveSudoku around those checks. Every puzzle in the bank has a fixed number, a stored solution, and a technique score. The daily puzzle is the same for everyone on a given local date. Hints describe the next logical step and link to the strategy page, and they only fill a digit if you ask a second time. The combination sheet is free, and so are the printable boards.

Other long-running places to play are worth knowing: sudoku.com’s killer mode, KrazyDad’s printable books, and the older dedicated killer sites that still publish a daily. They differ in whether the puzzle is generated in your browser, whether it has a stable number you can share, and whether difficulty means anything you can learn. Use the one that lets you get better, not only finish.

If you are choosing for a group that includes newer or older players, look at type size, contrast, and whether notes can be entered without a long-press guessing game. Those details decide whether someone comes back tomorrow. The puzzles themselves should be the quiet part.

Play a medium puzzle or open the combination sheet.