The struggle between different kinds of viruses makes sense of this game. The kind of virus, which stays on the playing-field wins.
Each virus has its own vital energy, which decreases with time. To enrich it , virus have to get vital energy from the source in order not to be killed.
Having been used up, life source vanishes from the playing-field and appears on the other place with the new vital energy.
Keywords: virus, energy, vital, kind, source, playing, life
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