How to Play

• Use the arrow keys or mouse to select a square.
• Use the number keys to fill each square with an integer between 1 and 4.
• Each integer must appear exactly once in each row and each column.
• The groups of squares surrounded by thick black lines are called "cages".
• Every cage is labelled with a value, and an optional operator.
• The integers within a cage must yield that cage's value when combined (in any order) with that cage's operator. If no operator is given, they must yield the cage's value when combined in some order with some operator. (Puzzles with these sorts of cages are called "no-op" puzzles, and generally considered harder.)
• Cages labeled with "???" have no constraints at all.

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You can add these puzzles to your iGoogle homepage by clicking the button below:

About this site

There are currently over 1200 puzzles on this site. Every puzzle has a single valid solution I think some of the puzzles, particularly the larger ones, may be a bit too difficult, but I suppose you'll have to determine that for yourself.

Are these KenKen puzzles? Technically, no. KenKen is a registered trademark, and the people behind it clearly intend to create a Sudoku-like frenzy for such puzzles, and then collect rents on their trademark. Therefore, I wish to make clear that I am, and my solver and puzzles are, in no way associated with official KenKen-brand products. That said, these puzzles can be solved with exactly the same techniques one would use to solve KenKen puzzles.

Incidentally, I have written a solver for KenKen puzzles. It's not needed for these, of course, since they come with built-in solutions, but you might find it useful for other, paper-based puzzles.

This site is part of an experiment in Internet marketing. If you have any questions, please e-mail me.