At Freeware Files.com you can download a freeware version of Slitherlink, one of my favorite puzzles especially when they are hand made by Nikoli.
The publisher calls this puzzle Loopy Puzzle although most of the times it is called Slitherlink (also known as fence puzzle , dotty dilemma and loop-the-loop puzzle). This freeware version of Slitherlink has different levels and even the option to create your own Slitherlink Puzzles.
Takes just 5 seconds to learn all three rules of slitherlink but it can often get very difficult to see the simple loop needed to win the game. At Passion for Puzzles we give you also some tips to solve Slitherlink puzzles.