Yukendo.

Nine digits. Nothing else.

Every digit 1–9 exactly once in each row, column and 3×3 box.

g h

  – Groschen 0:00

How to play.

Open as a page

Sudoku

The goal

Every row, every column and each of the nine 3×3 boxes holds each digit from 1 to 9 exactly once. Some digits are given; you work out the rest – no maths involved.

53?678912

Only the 4 is missing in this row – so it goes in the empty cell.

How to start

  1. Nearly full lines. Look for a row, column or box with only a few empty cells. Which digits are missing?
  2. Only one digit fits. Pick an empty cell and rule out every digit already in its row, column or box. If only one is left, that's it.
  3. Only one place. Pick a digit, say 7, and a box where it's still missing. Often there's just one cell left where it's allowed.
  4. Notes. If several digits could fit, write them into the cell as small notes. When you place a digit, it disappears from the notes around it.

You never have to guess: every puzzle here has exactly one solution, and Easy and Medium can be solved with these steps alone.

Playing here

Playing here

  • Fill in: tap a cell (or move with the arrow keys), then pick a number on the pad or keyboard. The same number again clears it.
  • Notes (N or ✎) switches to small pencil marks; Undo (Z) takes back the last step.
  • Three modes: Relaxed checks every number right away; Show mistakes marks duplicate numbers (and wrong cages) red; Like on paper marks nothing – you check at the end. The less help, the more Groschen.
  • Stuck? Check (1 Groschen) tells you if a number is right, Reveal (3 Groschen) shows the right one.

Keyboard

1–9
Put a number in the selected cell
← → ↑ ↓
Move between cells
N
Notes
Z
Undo
⌫
Erase
? · g h
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