How to Play Sandwich Sudoku

THE PLAYBOOK · HBZQCZZ

How to play Sandwich Sudoku

Sandwich Sudoku gives you a focused activity to play in your browser. Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. Keep the game area visible while you use its controls. Choose a comfortable screen position before beginning. Look at what changes after your first action.

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.

A useful comparison

Compare the worked example with your own position. Use the reasoning, not an answer copied from a different board. Refer to the controls when needed.

Your goal

Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. The feedback beside the game helps you follow the round. Review the board or playing area as it changes.

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. Read a button’s label before selecting it. Read the example below alongside these instructions.

A useful example

If the values strictly between 1 and 9 are 2, 4 and 7, the sandwich clue is 13. Compare this with the rule that governs the move. Take a moment to compare.

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. Watch the feedback after an action. A message can explain whether the input was accepted or whether a rule needs attention.

Common questions