The Zombie games have proven to be a popular, un-wavering genre that has not lost any steam over the years. Shelter Free is one such game that takes on the undead in card game style. You won’t find much arcade action where you run around the screen shooting up everything Zombie in sight. Instead, the game offers more of a strategic approach to exterminating the walking dead. The Windows Phone game is one of this month’s AdDuplex HERO Apps, which is a promotional campaign for Windows Phone and Windows developers on the AdDuplex network. The promotion partners AdDuplex with myAppFree, AppDeals, PluralSight and Windows Central to deliver a host of benefits to the top apps and games each month. As we have in the past, our role with the HERO Apps program is to spotlight these Windows and Windows Phone titles. And today Shelter Free from Survivalist Games takes center stage today.