KenKen

Goal: Fill the grid so each row and column contains the numbers 1 to N exactly once.

Cages: Groups of cells outlined in bold have a target number and math operation. The numbers you place must produce the target using that operation.

• + — numbers add up to the target
• − — difference of two numbers equals the target
• × — product of numbers equals the target
• ÷ — quotient of two numbers equals the target

Modes:

• Normal (N) — enter your answer into the cell
• Possible (G) — mark numbers in green you think could go here
• Eliminate (R) — mark numbers in red that can't go here

Notes appear at the bottom of the cell. When you enter a final answer, notes are automatically cleared.

Multi-select: In Possible/Eliminate mode, click multiple cells to select them all, then type a number to apply the note to every selected cell at once. Click a selected cell again to deselect it.

Controls: Click a cell, then type a number or use the buttons below. Backspace/Delete clears. Arrow keys navigate. Ctrl+Z to undo.

Difficulty: Rated by a solver — Easy puzzles need only basic elimination, Medium requires scanning techniques, Hard may need advanced logic.