Home Sudoku
Sudoku
The sample has 30 givens and 51 open cells. Its first answer row is 5 3 4 6 7 8 9 1 2. The puzzle stays in this browser.
30 given · 51 open · 0:00
The same digit repeats in a row, column, or box.
All 81 cells agree.
Why this exists
In English this puzzle kept the Japanese name sudoku, though Dell magazines had already printed it as Number Place. The grid is 9 by 9, with nine 3 by 3 boxes.
The sample has 30 givens and 51 open cells. Its first answer row is 5 3 4 6 7 8 9 1 2.
-
01How to use it
Choose an open cell and enter 1 to 9.
Easy, Medium, and Hard make a new puzzle. Sample returns to 30 and 51.
Notes leave small digits, and Hint writes one answer digit in the selected cell.
-
02What you get
The line above shows givens, open cells, and time.
A repeated digit changes the cell color.
When all 81 cells agree, a finished line appears.
Entered30 and 51
30 givens 51 open cells first row 5 3 4 6 7 8 9 1 2 hint one answer digit -
03Worth knowing
It does not teach a named technique.
It does not score the puzzle.
Nothing is sent to a server.
Questions
- QWhat are 30 and 51?
- A30 givens and 51 open cells.
- QWhat is the first answer row?
- A5 3 4 6 7 8 9 1 2.
- QWhat does Hint do?
- AIt writes one answer digit in the selected cell.
- QWhat does Hard do?
- AIt builds a new puzzle with fewer givens. The answer is still unique.
How this page works it out
This page plays a 9 by 9 sudoku. There are nine 3 by 3 boxes, and a digit may appear once in its row, column, and box. The sample has 30 givens and 51 open cells.
The sample’s first answer row is 5 3 4 6 7 8 9 1 2. A hint writes one digit of that answer into the selected open cell. Easy, Medium, and Hard build a new puzzle with one answer. Notes leave only small digits.
A named technique is not taught, and the puzzle is not scored. It stays in this browser and nothing is sent to a server.