KenKen

Goal: Fill the grid so every row and column contains each digit from 1 to N exactly once (where N is the grid size).

Cages: Groups of cells outlined in bold are called cages. Each cage shows a target number and a math operation (+, –, ×, ÷). The digits in the cage must combine using that operation to reach the target. Single-cell cages simply show the answer.

Operations: For addition (+), the digits add up to the target. For multiplication (×), they multiply to the target. For subtraction (–) and division (÷), the larger number minus or divided by the smaller gives the target.

Select a cell by clicking it, then click a number on the number pad to fill it in.

Pencil mode: Click the Pencil button to toggle pencil mode. In pencil mode, clicking numbers adds or removes small candidate marks – useful for tracking possibilities.

Errors: Duplicate numbers in the same row or column are shown in red.

Undo: Click Undo to reverse your last action. You can undo as many times as you like.

KenKen

Fill the grid so each row and column has unique digits – and each cage hits its math target.

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