6x6 Calcudoku Puzzles

The 6x6 calcudoku is the largest grid of this generator and the one that rewards method: thirty-six cells, the digits 1 to 6, and fourteen to seventeen cages per puzzle. The rows and columns add up to 21, the products grow quickly, and a cage like 240× or 96× narrows to a handful of digits at a glance.

Twelve puzzles in three sets of four: addition only, addition and subtraction, and all four operations. Each has a single solution that logic reaches without a guess, and the book gathers the twelve pages for printing in one go.

Part of the Calcudoku Puzzles collection, Last updated on Tue, 27 Oct 2026 17:56:19 GMT.

Free Printables

6x6 Calcudoku with Addition, Puzzle 1

6x6 calcudoku with addition only, seventeen cages: a single cell of 1, thirteen pairs from 3+ (1 and 2) to 11+ (5 and 6), and three three-cell cages (9+, 11+ and 16+). Addition, puzzle 1 of 4. | zuzuzi.com

6x6 Calcudoku with Addition, Puzzle 2

6x6 calcudoku with addition only, seventeen cages: three single cells (1, 3 and 4), nine pairs from 4+ to 10+, and five three-cell cages (7+, 10+, 12+, 13+ and 16+). Addition, puzzle 2 of 4. | zuzuzi.com

6x6 Calcudoku with Addition, Puzzle 3

6x6 calcudoku with addition only, seventeen cages: two single cells (1 and 6), twelve pairs, among them 3+ (1 and 2) and 11+ (5 and 6), two three-cell cages (9+ and 11+) and a four-cell 10+, which is 1, 2, 3 and 4 if it holds no repeat. Addition, puzzle 3 of 4. | zuzuzi.com

6x6 Calcudoku with Addition, Puzzle 4

6x6 calcudoku with addition only, sixteen cages: a single cell of 6, ten pairs from 3+ to 11+, and five three-cell cages, 4+ (1, 1 and 2 around a corner), 9+, 9+, 13+ and 13+. Addition, puzzle 4 of 4. | zuzuzi.com

6x6 Calcudoku with Addition and Subtraction, Puzzle 1

6x6 calcudoku with addition and subtraction, seventeen cages: two single cells (2 and 4), four subtraction pairs (1−, 1−, 2− and 5−, the last one being 1 and 6), eight addition pairs from 3+ to 10+, two three-cell cages (8+ and 12+) and a four-cell 15+. Addition and subtraction, puzzle 1 of 4. | zuzuzi.com

6x6 Calcudoku with Addition and Subtraction, Puzzle 2

6x6 calcudoku with addition and subtraction, sixteen cages: three single cells (1, 4 and 6), five subtraction pairs (1−, 1−, 2−, 2− and 3−), three addition pairs (4+, 5+ and 6+), three three-cell cages (9+, 11+ and 14+) and two four-cell cages, 10+ and 19+. Addition and subtraction, puzzle 2 of 4. | zuzuzi.com

6x6 Calcudoku with Addition and Subtraction, Puzzle 3

6x6 calcudoku with addition and subtraction, seventeen cages: a single cell of 6, three subtraction pairs (2−, 4− and 5−), ten addition pairs from 4+ to 11+, and three three-cell cages (7+, 11+ and 14+). Addition and subtraction, puzzle 3 of 4. | zuzuzi.com

6x6 Calcudoku with Addition and Subtraction, Puzzle 4

6x6 calcudoku with addition and subtraction, fifteen cages: two single cells (1 and 2), three subtraction pairs (1−, 1− and 2−), four addition pairs (3+, 4+, 9+ and 11+), four three-cell cages (9+, 10+, 12+ and 13+) and two four-cell cages (11+ and 15+). Addition and subtraction, puzzle 4 of 4. | zuzuzi.com

6x6 Calcudoku with All Operations, Puzzle 1

6x6 calcudoku with all four operations, sixteen cages and no given digit: four subtraction pairs, three products in pairs (8×, 18× and 20×, the last two being 3 and 6, then 4 and 5), a 5÷ pair (1 and 5), four addition pairs and four three-cell cages (10×, 48×, 5+ and 16+). All operations, puzzle 1 of 4. | zuzuzi.com

6x6 Calcudoku with All Operations, Puzzle 2

6x6 calcudoku with all four operations, fifteen cages: a single cell of 3, two subtraction pairs (3− and 4−), three products in pairs (4×, 8× and 18×), two addition pairs (4+ and 5+), four three-cell products (18×, 24×, 30× and 96×, which can only be 4, 4 and 6) and three three-cell sums (10+, 11+ and 13+). All operations, puzzle 2 of 4. | zuzuzi.com

6x6 Calcudoku with All Operations, Puzzle 3

6x6 calcudoku with all four operations, sixteen cages: two single cells (5 and 6), four subtraction pairs, two products in pairs (5×, which is 1 and 5, and 6×), a 2÷ pair, two addition pairs (4+ and 8+), a three-cell 48×, three three-cell sums (5+, 9+ and 10+) and a four-cell 16+. All operations, puzzle 3 of 4. | zuzuzi.com

6x6 Calcudoku with All Operations, Puzzle 4

6x6 calcudoku with all four operations, fourteen cages and no given digit: a 24× pair (4 and 6), three division pairs (3÷, 5÷ and 5÷, the last two being 1 and 5), three addition pairs, four three-cell products (8×, 30×, 36× and 48×), two three-cell sums (11+ and 13+) and a four-cell 240×. All operations, puzzle 4 of 4. | zuzuzi.com

How to Solve a 6x6 Calcudoku

Begin with the extremes of each operation: a pair of 11+ is 5 and 6, of 5− is 1 and 6, of 6÷ is 1 and 6, of 30× is 5 and 6; a three-cell cage of 6+ in a line is 1, 2 and 3, of 15+ is 4, 5 and 6, and a 120× cage of three cells is 4, 5 and 6; a 240× cage of four cells almost always holds 2, 4, 5 and 6. Then use the rule of 21 on each row and column, and the factors of a product cage to list its candidates. Write small, cross out, and return to the cage with one option left.

Frequently Asked Questions

What makes a 6x6 calcudoku harder than a 5x5?

More cages, more candidates per cell, and products with more factorisations: 12× in three cells can be 1, 2 and 6, 1, 3 and 4, or 2, 2 and 3 around a corner. The method is the same; the bookkeeping is longer.

Is there a quick check at the end?

Yes: every row and every column must add up to 21 and contain each digit 1 to 6 once, and every cage must give its number with its operation. One wrong digit breaks at least two of these at once.