Alter Life - Version 1.1 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.