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.

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