YAOKU

A QUIET MOMENT. A NEW CONNECTION.

Y A O K U

Where every number connects.

Follow the sums. Find the products. Let the pieces fall into place.

FREE PLAY

CRAFTING YOUR PUZZLE
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Finding the connections…

Creating a fresh, uniquely solvable puzzle.
Given Product badge0 / 24 connected

Select a white cell, then choose a card.

Freshly generated. One solution.

One number at a time.
It all comes together.

AN EVERYDAY EXERCISE IN POSSIBILITY

A DIFFERENT KIND OF NUMBER PUZZLE

Number puzzles. Connected by logic.

YAOKU brings sum clues, product badges, and Loose Cards together in one quiet logic game. Explore 1,000 numbered puzzles or generate a fresh Free Play challenge in your browser, with Easy, Medium, and Hard options.

Your entries, notes, and progress stay in this browser on this device. No player account is needed. YAOKU is for ages 13 and older.

A ONE-MINUTE QUICK START

How to play

Tap an empty white square. Tap a Loose Card to fill it. Your goal: fill the grid so every clue works.

  1. Arrows mean add. The white squares along an arrow add up to its number. For example, 12 → could be 3 + 4 + 5. Stop at the next gray square or the edge. Don't repeat a digit in that group.
  2. Small square badges mean multiply. The two white squares touching a badge multiply to its number. A 3 above-left and 0 below-right means 30: try 5 × 6.
  3. Use every Loose Card once. Matching cards are separate copies. Bold numbers with a dot are already fixed—leave them there.

That's it: tap, add, multiply. Try a card; Undo and Erase let you change your mind. Stuck? Tap Hint.

More details & keyboard shortcuts
  1. White squares use 1–9. Gray squares hold clues or blocks. A gray square can have both an across clue and a down clue.
  2. Each arrow is its own group. No repeated digits within a group; repeats in other groups are allowed. There are no Sudoku boxes.
  3. A badge connects just two neighbors. Left/right on a vertical boundary, or above/below on a horizontal boundary. Read tens above-left and ones below-right: 06 means 6. Zero belongs only in a badge.
  4. The cards are shuffled. Their order gives no hints. Fixed numbers do not use cards.
Keyboard & pencil notes

Type 1–9 to enter a digit. Arrow keys move. Backspace erases. N toggles notes. Ctrl/⌘ Z undoes. Notes are pencil marks and do not use cards.

Collection ratings use automated deduction metrics and are provisional until human playtesting. Free Play ratings use generator clue profiles, also provisional. New puzzles are generated in your browser and checked for a unique solution. Your games, entries, notes and progress are saved on this device, not synced across devices.

ONE CONNECTION AT A TIME

YOUR PROGRESS

Saved only in this browser on this device; not automatically synchronized. Best times exclude games using hints. Published totals reflect the verified collection loaded here.

A PUZZLE TO PASS ALONG

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Recipients will start the same puzzle from the beginning, with the same givens—your entries and notes won’t be shared.

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EVERYTHING CONNECTS

Beautifully done.