Candidate Display
Select
Candidates
to display.
To enter a new puzzle click a cell and select a number for that cell.
Enter all the given numbers then click the "Start" button to begin
solving. To work on a sample puzzle select it from the list below.
To work on a puzzle click on a cell then use the yellow box to
add or remove candidates and the blue box to enter a value.
The colored buttons can be used to color cells to assist
solving. Use the "Undo" button to remove your previous changes.
If you want help to solve the puzzle click the "Next" button
and the helper will show you a next step.
Use the "Test" button to make sure the puzzle has a unique
solution.
Solving Strategies
Select Strategies to use.