You are a mouse in a maze with food cells in it. To enter a food cell you must first collect a key to gain access and then gobble, gobble, gobble. After eating all the food in one section you get fat and can't pass through some of the narrower gaps. To shrink to normal size you should wait on the edges of the maze for Deflator Dennis to come and deflate you.
After emptying all four food sections the bonus letter will move around the screen - catching this will give you extra points. If you complete a full word you get even more points.
To defend yourself from the Frobblies there are a limited number of bombs for your disposal. Extra bombs are gained after every three screens are completed.
The graphics are average. To play the game you need to continually hold the joystick in the required direction. I would have preferred it if you only needed to do this to change direction so that faster reactions would be possible.