On the screen is a grid of rectangles, and your aim is to move a space-ship around it.
Every time you complete four sides of a rectangle, it changes colour, and you have to change the whole of the grid. Two things make this difficult. One is that it's quite hard to get the space-ship to stop exactly at an intersection - and if you overshoot you have to start again. The other is, you're being chased by bugs.
Although the idea is extremely simple, this game - like Demon Decorator - is surprisingly addictive. As you complete more and more of the grid, it becomes progressively easier to complete new boxes.
Luring you on is the knowledge that if you reach the four corners of the grid you can turn tables on the bugs and eat them.
Your progress is marked by a red trace, which infuriatingly disappears every time you overshoot an intersection and have to reverse.
In all, a thoroughly enjoyable game - but for one that's so simple, I think it's overpriced,