How to Play Sandwich Sudoku

THE PLAYBOOK · GLSFW

How to play Sandwich Sudoku

Open Sandwich Sudoku, check the instructions and begin a round. Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. Check the relevant rule before repeating a move. Use the opening round to become familiar with the layout. 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. 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. An attractive position is not enough unless the goal is met. 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. Use the control method described here for this activity. Use one clear input at a time.

A useful example

If the values strictly between 1 and 9 are 2, 4 and 7, the sandwich clue is 13. Use the example as a guide rather than a substitute for reading your board. 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. Compare the situation with the worked example. Locate the buttons and input area before beginning a long round. Use the on-screen labels to avoid an accidental restart.

Common questions