Solve this KenKen where each row and column contains the numbers 3, 1, 4, 1, 5, 9, 2, 6. This means that the digit 1 will appear twice in each row and column.
This puzzle was created with PuzzleJS, a framework that lets website authors quickly render interactive puzzles in HTML while retaining control of the visual look.
This demo has been added to celebrate both Pi Day and the beginnings of the PuzzleJS validation framework, which contains both hash-based validation and an extensible mechanism for logic-based validation against the rules of the puzzle.
For the puzzle below, the kenken mode automatically adds data-validators="text-unique-in-row text-unique-in-column text-math-in-region" (though this can be overriden if desired) and the duplicate 1 is permitted/enforced because it appears twice in data-text-characters="31415926".
Stumped? Here is a version with operators.