How to Play Sandwich Sudoku

THE PLAYBOOK · YINGONG123

How to play Sandwich Sudoku

Choose a round of Sandwich Sudoku and settle into its rules. Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. Use the example below to understand a decision. Treat the first round as a chance to learn the controls. Use the example below to understand a decision.

This collection contains 8 puzzles. Progress is saved in this browser. The same puzzle can appear again; the collection is not labelled with calibrated difficulty levels.

Try a deliberate move

After a move, check what changed. Decide which rule explains the new state before acting again. Notice the feedback after each input.

Your goal

Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. Read that aim before choosing your first action. Keep the controls in easy reach.

Step by step

1. Select an editable cell.
2. Enter a value using the keypad or keyboard; Notes stores candidates.
3. Read the region, cage, arrow or outside clues alongside the normal constraints.
4. Check entries verifies the completed board; Undo reverses your last input.
5. New puzzle selects another included puzzle.

Controls

Click or tap cells and the digit pad. Use Notes, Undo and Reveal selected. Large boards scroll inside the game. On a smaller screen, keep the active part of the board within view. Check any mode label before starting.

A useful example

If the values strictly between 1 and 9 are 2, 4 and 7, the sandwich clue is 13. Your next round may have a different position, so inspect it before acting. Verify the rule before continuing.

Watch out for this

A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction. Take a moment to reassess the position before continuing. After a move, check what changed. Decide which rule explains the new state before acting again.

Common questions