Deadly sub-atomic particles are running free in a scientific research centre. It is your job to trap the darting Leptons using a robot craft before your time runs out. As you move thr craft across the screen a green ion-train is dragged along behind. When you reach the edge again the smaller area, confined by this green line, is filled in. A Lepton is captured if it is trapped in this area or if 95% of the screen has been filled. A bar running along the bottom of the screen indicates the percentage of the total area remaining to be filled. Enclosed areas are coloured red, but at any time you can switch to the faster speed and areas so filled are coloured pink.
Higher levels introduce Chasers which move along the borders. A life is lost if you collide with one of these or is a Lepton hits your trail. The number of Leptons and Chasers increases up to a maximum of 5 each. An extra craft is obtained on completion of the third, sixth and ninth screens.
A good strategy is to build small narrow pink blocks up the centre of an unfilled area in fast mode and then to finish off by using the slower mode to reach the top of the screen and capture the Lepton.
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This exhibit has a reference ID of CH51172. Please quote this reference ID in any communication with the Centre for Computing History.
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