📖 How to play Sandwich Sudoku
- The sudoku rules apply: 1 through 9 with no repeats in each row, column, and 3x3 box.
- The number outside a row or column is the sum of the digits left between the 1 and the 9 in that line (the "filling of the sandwich" between the two "slices," which are the 1 and the 9).
- A 0 means the 1 and the 9 sit right next to each other (nothing between them).
- Each puzzle has a unique solution.
💡 Tip: locating the 1 and the 9 in each line is key. A sum of 0 means they're adjacent; a very high sum means they're near the ends.
✏️ Notes mode: press the ✏️ button on the keypad (or the N key) to jot down candidates in the empty cells.
📖 Want to master it? Read the full guide: How to play Sandwich Sudoku: rules and tricks.