In the hugely competitive world of mobile games, which have to work that little bit extra hard to capture our attention while they're squeezed onto platforms bulging with new releases and valued at throwaway prices, Virus Wars is yet another worthy and addictive distraction from endless work emails, Twitter notifications and text messages.
Gameplay-wise it's similar to Dots and Boxes, an ancient two-person pen-and-paper game I used to play on school coach journeys before Game Boys were invented [surely you weren't alive then? -Ed]. Virus Wars greatly improves on the formula, however.
The game tasks two players (likely you versus the remarkably savvy AI) with marking territory across a gridded page of squares, starting at opposite corners and moving one space at a time. Each space you move through gets a crayoned cross in your colour (the mark of your 'virus') and from each of these crossed squares you can spread your territory to further infect the playing surface in any direction.