Sandwich Sudoku

THE PLAYBOOK · QTHCC

How to play Sandwich Sudoku

A round of Sandwich Sudoku at QTHCC begins with understanding the objective. Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column. The learning focus here is mistake-aware practice, supported by the rule notes below.

8 finite checked puzzles, with local saved progress. No claim of unlimited daily puzzles or calibrated difficulty.

Mistake-aware practice

Read the common mistake below before starting. Watch for that situation during the round rather than relying on trial and error.

Your goal

Solve the Sudoku while each outside clue gives the sum strictly between 1 and 9 in that row or column.

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.

A useful example

If the values strictly between 1 and 9 are 2, 4 and 7, the sandwich clue is 13.

Watch out for this

A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction.

Common questions