This very novel game, written in machine code, is set within an imaginary computer whose insides are displayed on the screen. This shows the CPU as the heart of the coomputer, with all its connecting data lines radiating out to the sides of the screen.
The rest of the computer's more colourful components (resistors, transistors, etc), are attacking the CPU, which you have to protect by firing pulses of electricity down the data lines. This will destroy any component moving along the data line selected, but if a component should reach the CPU, then a life is lost. There is also a 'zap' key, which destroys all the attacking components on the screen. This can only be used once every 20 seconds.
This somewhat fanciful game is surprisingly good to play. The graphics and sound are to a high standard, and the game represents good value for money.