Today only, August 22, 2011, ZStudio has ZDefense for Android in the Amazon AppStore for FREE ($1.99 value) for a limited time.

ZDefense distills the best elements of tower defense games. This game features sharply drawn, geometric shapes on a hexagon grid, recalling the timeless old-school designs of such arcade classics as Tempest and Breakout. This fast-paced game will challenge even the most experienced tower defense fans.