Curious Cheetah
Hidoku
Background
This puzzle was invented by Dr. Gyora Benedek under the name Hidato.
Puzzle and Goal
An unsolved puzzle consists of a cluster of squares, sometimes but not always rectangular. Some cells contain numbers.
The goal is fill the grid with numbers from 1 to n, where n is the total number of cells in the puzzle.
Rules
The solved grid must satisfy the following conditions:
Each number must be adjacent to the next higher (and lower) number.
Other Names
Hidato; Numbrix