Maths Small Puzzles: Mathrax Puzzles - The Best Japanese Puzzles Collection

consists of a square grid. The goal is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row or column. Circles with additional conditions may be situated on intersections of lines inside the grid; a circle may contain:• A number and a sign of mathematical operation (addition, subtraction, multiplication, division) - a number is a result of an operation execution with numbers in diagonally adjacent cells. • A letter "E" ("even") - all numbers in four cells are even. • A letter "O" ("odd") - all numbers in four cells are odd. math puzzle books for adults - math puzzle books - math puzzle for adults - mathematical puzzles - mathematical puzzle books - mathematical puzzle books for adults - mathematical puzzles with answers - mathematical puzzle games - mathematical puzzle books - mathematical games and puzzle - mathematical crossword puzzle with answers - mathematical jigsaw puzzle - japanese mathematical puzzle - mathematical logic puzzle - mathematical matrix puzzle - mathematical mind puzzle - mathematical matching puzzle - math puzzles for middle school - math puzzle brain teasers