Today’s featured promo on MacUpdate offers Biofilm and Mountain Tanks for US$14.95 (58% off, retail $36). “Biofilm allows you to play with the various types of Bacteria in this real-time strategy game based around them! In a soup of bacterial life propagation is the only goal. In Biofilm players are introduced to the hidden complexities and dangers of their world. Mountain Tanks is a game where you choose your weapon, take careful aim, and pound your opponent’s city into the dirt! Mountain Tanks puts you in the gunner’s seat of a powerful tank, the lone defender of an embattled city, with a selection of destructive and defensive weapons at your disposal.” Both applications require Mac OS X 10.3.9 or later.