Online solving using Penpa

• Please click on any puzzle name on the left to start solving online.
• After solving the puzzle, you use boxes at the bottom to submit the puzzle.
• Puzzles are not saved / submitted automatically. Ensure that you submit correctly before switching puzzles.
• Upon refreshing the browser or closing the contest page, all the progress will be lost.
• If you see a scrollbar or if you can't see the full grid or if you can't type a digit on the grid, click on the puzzle name on the left.

New to Penpa

• If you are new to Penpa, please read this guide on Penpa here. A more detailed guide is available at Penpa home page

Supported Browsers

• Latest versions of Google Chrome, Microsoft Edge, Opera.
• At this point, we do not support Firefox.