Sandwich Sudoku Calculator

Configuration

Notation

Grid Size

Sandwich Sum

Direction

Game Component

Buffer Factor

Position of 1

Position of 9

Solver Count

Time Limit

Quick Presets

Game Components

Cells

9x9 Grid · 1 Solver · 30 min

Cells

6x6 Grid · 1 Solver · 10 min

Sandwich Clues

Edge Markers · 1 Solver · +10 min

Digit Tiles

0.75in Tiles · 1-4 Players · Varies

Grid Configurations

Grid Type	Size	Inner Digits	Max Sandwich	Total Cells
9x9 Standard	9x9	7 (2-8)	35	81
6x6 Mini	6x6	4 (2-5)	14	36
4x4 Micro	4x4	2 (2-3)	5	16

Sandwich Sum Ranges

Grid	Max Sum	Inner Range	Common Sums
9x9	35	2-8	0, 7, 14, 21
6x6	14	2-5	0, 5, 7, 10
4x4	5	2-3	0, 2, 3, 5

Common Sandwich Values (9x9)

Sum	Combos	Digits Between	Placements	Difficulty
0	1	0	16	Easy
7	3	1-2	12-14	Easy
14	5	2-4	8-12	Medium
21	4	3-5	6-10	Hard
35	1	7	2	Easy

Solver Configurations

Solvers	Grid	Avg Combos	Solve Time	Style
1	9x9	5-8	30-60 min	Standard
2	9x9	5-8	15-30 min	Collaborative
1	6x6	2-4	5-15 min	Quick
1	9x9	1-3	15-30 min	High Clue

Tip: In a 9x9 grid, sandwich sum 0 means 1 and 9 are adjacent with no digits between them, giving 16 possible placement pairs across the row.

Tip: The maximum sandwich sum of 35 requires all digits 2-8 between 1 and 9, leaving only 2 valid placements (1 and 9 at opposite ends of the row).

Sandwich Sudoku is good variant of Sudoku that mixes a bit of math in the solving. It obeys the basic rules of normal Sudoku. In every row column and block must appear all numbers of 1 until 9 without repetitions anywhere.

Some versions work on 6×6 grid here every row column and 2×3 box stores the figures 1 until 6.

How to Play Sandwich Sudoku

The puzzle comes with extra numbers outside of the grid at every row and column. Those numbers show the amount of the cells between the 1 and the 9 in that row or column. For 6×6 grids the clues show amounts between 1 and 6.

All such Sudokus need at least one 1 or 9 to explain the amounts. Without them the answers could be several.

Sandwich Sudoku calculator or something like SumUp really help. SumUp shows all possible combinations for each amount. Like this you quickly see possibilities for some box during solving of Killer Sudoku.

Combination panel for Killer and Sandwich puzzles can be hidden or turned on in game settings. Also found online solvers for variants as killer little killer thermo and sandwich.

Math helps in the logic of the game. For some row or column the amount of 1 until 9 is 45. The cells between them total 35 minus the Sandwich amount.

The 10 comes from 1+9. Some Sandwich Sudokus have amounts with only one combination. For example for divide 15 in four cells it is possible only by means of 2 3 4 and 6.

Because 1 and 9 form the breads they cant be use for the inside part. So from 3 6 7 8 stay only two ways with 4 5 7 8. Generator for Sandwich Sudoku puzzles are available on GitHub.