Hidato is a pure logic puzzle that's easy to learn but difficult to master, making it the perfect challenge! Like Sudoku, Hidato features the compelling combination of easy-to-follow rules and increasingly difficult puzzles. Each Hidato puzzle starts with a grid partially filled with numbers. To succeed, just finish filling the grid with consecutive numbers connecting horizontally, vertically, or diagonally. It sounds so simple. Why not give it a try, and see for yourself why Hidato is rapidly becoming the new brain teasing craze! Each volume of the series presents 203 brand-new Hidato puzzles at five difficulty levels, giving hours and hours of fun and entertainment. And now, two bonus "I dare you" puzzles to wreck your mind. New volumes are made available on the first of each even month (Feb., April, June, Aug., Oct. and Dec.). Because Hidato helps develop logic skills, the Davidson Institute of Science Education, the educational arm of the world-renowned Weizmann Institute of Science, recently granted Hidato puzzles to outstanding kids participating in their math and science online programs.