The Stripy Sudoku Solver
New: Version 2.34 (Apr 9th 2025)
Added 'Hints Mode' next to Take Step. Choose between only revealing the next strategy,
just the pattern or just the eliminations.
New in version 2.31.2 (17th Feb 2025)
I have optimised my board generator and one of the benefits is much quicker generation of
puzzles with extra constraints like Stripy. From the initial batch I've selected four of each
grade. As a tribute to the example sent to me by a user (who got it from a geo-location puzzle)
that remains the first in the example list.
Stripy is the same puzzle as normal Sudoku but with an extra constraint. In a similar
way to the rows, columns an boxes, the stripes must also be uniquely 1 to 9.
All Sudoku strategies continue to apply - except the ones that rely on the deadly pattern
used by Uniqueness strategies.
All feedback, comments, arguments, bug reports and strategy ideas are welcome. There is a new
FEEDBACK form with a column displaying comments and questions.
Many thanks to all the people who have done so and helped improve this solver.
Version 2.19 (June 12th 2024)
Added Stripy Sudoku
New in version 2.28.1 (14th Nov 2024)
New
Packed String Definition and transport scheme
Full version history
here
Solver help
Use the "Import a Sudoku" button or type in a Sudoku puzzle in the small board.
You can also pick examples from the list above. Click on
Take Step to step through the solution.
Unknown squares are filled with 'candidates' - possible solutions.
Any cells that are reduced to one possible candidate are solved.
You can use the
[<<] button to
step back one go. Toggling between
Take Step
and
[<<] helps you see the changes.
Pressing "Enter" on the keyboard after clicking on
Take Step
is a quick way to activate "Take Step". Details of any solutions will
be written out in the text box below the big board. Strategies are ordered by complexity. Any
strategy that is successful returns the step-through to the start.
Click on the board to highlight sets of numbers. You can edit the Sudoku at any time - entering solutions in the small board or editing candidates.
(Toggle between highlighting and editing using the radio buttons at the top.)