* Mathematical or arithmetical; 160 cross sum puzzles * Find the numbers that verify arithmetic / mathematics operations. * Medium to hard difficulty level * Two puzzles per page * For greater variety, there are multiple types of puzzles depending on the chosen set of arithmetic operations and depending on the number of initial clues located inside the puzzle's grid. * Puzzles with three initial clues inside the puzzle grid (like a partially filled puzzle) * Puzzles with two initial clues inside the puzzle grid * Puzzle with one initial clue in the puzzle grid * Puzzles with no initial clue at all inside the puzzle grid * Puzzles with additions only * Puzzles with additions and with subtractions * Puzzles with multiplication only * Puzzles with difference only * Puzzles with the operations chosen from all 4 arithmetic operations: addition and subtraction and multiplication and division * somewhat between kakuro and calcudoku variant * puzzles have a bit of lined spaces (at the side of the puzzle) for annotations or notes. * number puzzles, math puzzle, arithmetic puzzles
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