Sudoku

The classic 9x9 number puzzle. You set the starting clues; participants fill in the blanks.

Who can do this: Org admins.

Where: Event → Content → Challenges → Create → Sudoku

Set it up

1. Create the challenge and fill in its details (see Create, edit, open and close challenges). It is saved as a draft until it has content.
2. Under Game content, either click Generate random puzzle, or type the starting clues into the grid yourself.
3. Click Solve & Save. The puzzle is solved and checked before it is saved, and the solution is shown with the count of givens and blanks.
4. Click Go live.

Solve & Save refuses a puzzle that:

• has fewer than 17 starting clues;
• has no blank cells;
• has no solution, or more than one (participants solving it another valid way would be marked wrong);
• is too sparse to check automatically. Add more clues spread across rows, columns and boxes, or generate one instead.

How it scores

The challenge’s points times the share of blank cells filled in correctly.