Based on what seems to be an original theme, the object of Gridtrap is to get to each of five bombs before they explode, without back-tracking on yourself.
To bar your way there are boots which wander around the grid, and skull and crossbones occupying various positions. You may move in four directions, leaving a trail behind you, but you may not cross this trail.
You get extra points for collecting the flags which are situated in various grid positions and for getting to the bomb on time. You lose a life if you move onto a skull and crossbones or cannot get to the bomb.
The graphics are quite good although perhaps light colours are used too much. This looks slightly unclear with a black background. The sound is average. Fortunately, it is possible to turn off the irritating background noise.
The game offers you plenty of control over the playing options, via control screens and selection keys.
If you feel confident about your high-score you may enter a competition by sending off your "magic high score number" with your name and address.