This is a program for the 48K model to help children learn about compass points and co-ordinates by hunting for an "invisible man" hidden in a 15 x 8 grid. The idea is to key in co-ordinates until you find all the positions his body occupies on the grid. If your attempt is unsuccessful, you're given a hint in the form of a compass bearing - "try South West", for example.
On-screen instructions are very brief, but quite explicit - as long as you already know what co-ordinates are! You have the choice of three levels of difficulty, based on the time limit you have to complete your search.
Though the idea behind the game is a good one, both the introduction and playability leave a lot to be desired. There isn't enough variety to hold a child's attention for long, and the graphics are nothing special.
A nice tune is played when a game is completed successfully, but I doubt if this is enough to encourage the repeated use and learning by repetition that should be the aim of the game.