Around the end of the nineteenth century, a group of games collectively called "hop over" puzzles became popular. These were solitaire games, the object of which was to move a set of pieces on a board so that their positions were swapped, taking as few moves as possible. Pebbles on the move brings one of these charming puzzles to your Psion compatible hand held computer. Also works on the Osaris and the Geofox. See the web page http://pebbles.snigfarp.karoo.net/ for details.