Peg Puzzle : Virtual Manipulatives

I've seen this type of problem before, for example, using frogs jumping over each other. I have always enjoyed this problem especially because I can never seem to remember how to solve it. So every time I see the peg puzzle, it is like starting all over. The idea seems to be simple enough that is until someone gets to about 6 pegs. The pattern seems to be obvious but after solving the puzzle for the first time, repeating the process is not easy. After repeating the process you can start figuring out other patterns that are not so obvious. Using this would help a student look beyond just a simple pattern. Also using the virtual manipulative is more convenient than having actual peg puzzles in class.