Platon Sudoku · Sudoku Study

Stuck on a Sudoku? Find your next logical move

Read the related lesson, inspect its example, then return to your puzzle. Which Cell to Fill Next.

This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.

What to look for

Not sure where to look? Try a digit that already appears often. Here we choose 8 and look for boxes still missing it.

This box needs a 8. The marked digits rule out the crossed cells: a row or column cannot repeat 8.

The box must contain a 8. After ruling out the other positions, only the highlighted cell remains.

Look at another box missing 8. The existing 8s rule out positions until only one place remains here too.

Scan the boxes for the same digit. If you find no clear move, try another digit. Fill a cell when you can explain why.

Read the related lesson, inspect its example, then return to your puzzle.

This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.