Curious Cheetah
Country Road
Background
The origin of this puzzle is not known, but it appears to have first been published by Nikoli.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid divided into regions.
The goal is to create a single closed loop according to the rules.
Rules
The solved grid must satisfy the following conditions:
The loop must enter and exit each region exactly once.
Not all cells need to be visited; however, unvisited cells in different regions cannot be orthogonal neighbors.