Save your organism by attacking all viruses and stop them from injecting their DNA material into the cells! There are five different cells: simple (green) cells, stronger (blue) cells, faster (red) cells, (grey) defense cells and (yellow) cells that reproduce faster. The defense, reproduction and power characteristics (so-called 'evolution genes') can be redistributed after each level to get the right balance. You can also attack one virus with several cells at once!
Hold the left mouse button while connecting a cell with a virus. Move over a number of cells and then connect them with a virus, to attack the virus with more cells at a time!