The aim of Plague Inc is to create your own virus, then devise a dastardly strategy to infect everyone on the planet and ultimately kill them.
There are lots of ghastly tools to help you, including ticker-tape news alerts that warn of natural disasters you can exploit, or attempts by pesky humans to find a cure that will need to be quickly stamped out. The game is strangely calming as you evolve your virus and watch it spreading out across the world map.
I bailed out early with a slightly sick feeling, having infected 2.3bn people in about five minutes of real-time action - by which point, fortunately, nobody had died.
