is a logic puzzle game from Japan. It is also spelled hutosiki (using Kunrei-shiki romanization). The puzzle is played on a square grid, such as 4 x 4. The objective is to place the numbers 1 to 4 (or whatever the dimensions are) such that each row, and column contains each of the digits 1 to 4. Some digits may be given at the start. In addition, inequality constraints are also initially specified between some of the squares, such that one must be higher or lower than its neighbour. These constraints must be honoured as the grid is filled out. The puzzle book contain: - 200 Puzzles - Handy 6 x 9 inch Book Layout - 2 Puzzles per Page - Ideal for both Beginners and Experts In the book you will find a description and examples of solutions for all puzzles. The book is for those who like logic and math problems. Decide, developing and improving.