CalcuDoku

Addition, subtraction, multiplication and division will never be the same again

The math teaching puzzle from Japan
Fun, addictive and fascinating
Simple rules, very easy to learn
Requires no language skills
Wide range of logic and difficulty levels
Develops logical deduction and reasoning

SingleOp CalcuDoku

Each puzzle consists of a grid containing blocks surrounded by bold lines. The object is to fill all empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result shown in the top-left corner of the block according to the math operation appearing on the top of the grid. In CalcuDoku a number may be used more than once in the same block.

See CalcuDoku rules

: SingleOp CalcuDoku 4x4.a.n; Difficulty: Ultra easy

: SingleOp CalcuDoku 5x5.m.n; Difficulty: Very easy

: SingleOp CalcuDoku 6x6.a.n; Difficulty: Medium

DualOp CalcuDoku

Play new puzzles each week

Each puzzle consists of a grid containing blocks surrounded by bold lines. The object is to fill all empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result of the math operation shown in the top-left corner of the block. In CalcuDoku a number may be used more than once in the same block.

See CalcuDoku rules

: DualOp CalcuDoku 4x4.as.a; Difficulty: Ultra easy

: DualOp CalcuDoku 5x5.as.a; Difficulty: Easy

: DualOp CalcuDoku 6x6.md.a; Difficulty: Medium

QuadOp CalcuDoku

Play new puzzles each week

Each puzzle consists of a grid containing blocks surrounded by bold lines. The object is to fill all empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result of the math operation shown in the top-left corner of the block. In CalcuDoku a number may be used more than once in the same block.

See CalcuDoku rules