Keen

A number grid with arithmetic clues.

Free to play · No account · In your browser · Play game ↓· Game settings ↓

KEEN

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Game controls & settings

Each row and column holds 1 to N once · each outlined cage makes its number with its sum (+), product (×), difference (−) or quotient (÷) · ARROWS move · 1-9 enter (again to clear) · 0/BACKSPACE clear · M pencil marks on/off · SPACE count up · S size · U undo

How to play Keen

Place 1 to N exactly once in every row and column. Each outlined cage must produce its target using the shown arithmetic operation. Play with the original Nickelbar rules and board drawings. Help below the game lists its keyboard and mouse shortcuts. Your current game stays in this browser tab.

Select a square and enter a digit, or click again to count up.
Use M for pencil marks and 0 or Backspace to clear.
Complete all rows, columns and cages. S selects another size.

Keyboard & mouse controls

LEFT selects a cell (again: dial it up), RIGHT clears, the wheel dials the digit

Arrow keys: Move or select a square
Space / Enter: Play the selected move, or resume
N / P: New game / pause
H / Tab: Help and settings / choose a game
U: Undo (where available)

Click the board before using keyboard controls. On a phone, you can also use the buttons beneath it.

Common questions

Is Keen free?

Yes. Play in your browser without an account or a download.

Can I pause and come back?

Press P to pause. Your current game is kept in this browser tab’s session; your best score is stored on this device. Clearing browser data removes saved progress.

Where is this game from?

The game engine and board drawings come from Nickelbar by Cob Muddybug, adapted to run in a browser. MIT licence and credit.