5 categories
Number Games
Digit-based puzzles to build arithmetic and logic skills.
Number Search
Hunt numbers in a grid
Word-search style puzzles using numbers instead of letters. Adjustable grid and difficulty.
Open generatorNumber Fill
Solve numeric sequences
Fill-in-the-missing-number puzzles based on patterns and arithmetic sequences.
Open generatorNumber Fill-In
Crossword-style number placement
Generate crossword-style number fill-in puzzles. The grid and digits are generated automatically — no input required. Includes full solutions.
Open generatorSudoku
Classic 9×9 logic puzzles
Generate Sudoku books with Easy, Medium, Hard, and Expert puzzles. Each puzzle has a unique solution.
Open generatorCalcudoku
Math + logic grid puzzles
Generate Calcudoku (a.k.a. Mathdoku) books. Each row and column contains the digits 1..N exactly once, and bold-outlined cages must reach a target using +, −, ×, or ÷.
Open generatorKakuro
Cross sums logic puzzles
Generate Kakuro (Cross Sums) books. Fill white cells with digits 1–9 so each run sums to its clue with no repeats. Mixed grid sizes, full solutions included.
Open generatorSudoku v2
Stylised 9×9 Sudoku
Classic 9×9 Sudoku built from band/stack permutations of a canonical solution. Each row, column, and 3×3 box contains the digits 1–9 exactly once.
Open generatorKiller Sudoku
Cage-sum Sudoku variant
Sudoku with no givens — instead, every cell belongs to a dashed cage with a target sum. Digits inside any cage are pairwise distinct.
Open generatorChaos Sudoku
Irregular-region Sudoku
9×9 Sudoku where the standard 3×3 boxes are replaced by nine irregular 9-cell regions. Rows, columns, and regions each contain 1–9 exactly once.
Open generatorKakuro v2
Book-format cross sums
Cross-sums variant with mirrored header layout (sums sit on the right and bottom). Each row and column run sums to its labelled target with no repeats.
Open generatorCalcudoku v2
Book-format math grid
Larger Calcudoku puzzles with multi-cell flood-filled cages labelled in op:total form. Each row and column contains 1..N exactly once and every cage matches its target.
Open generatorNumber Puzzle
Quick arithmetic word problems
A printable list of bite-sized arithmetic word problems. Difficulty controls the number of questions and the magnitude of the operands.
Open generatorNumber Pyramid
Sum-pyramid puzzles
Each cell equals the sum of the two cells directly below it. Some values are hidden — work bottom-up or top-down to fill them in.
Open generatorMath Puzzle
Fill in the missing operand
Single-digit equations with one operand replaced by a blank. Use +, −, ×, and ÷ to figure out the missing number.
Open generatorSum Puzzle
Row and column sum targets
A small grid of digits with row and column sums printed at the edges. Fill in the hidden cells so every row and column hits its target.
Open generator