The Giant Book of Logic Puzzles - Hidoku 600 Extreme Puzzles (Volume 5)

Hidoku (from Hebrew: "my puzzle") is a logical puzzle. The goal of Hidoku is to fill the grid with consecutive numbers that connect horizontally, vertically, or diagonally.

In every Hidoku puzzle the smallest and the highest number are presented in the grid. There are more numbers on the board to help to direct the player how to start the solution and to ensure that Hidoku has only a single solution.