Fortress Seven International is a survival strategy game, build and expand your underground fortress, survive the tide of corpse castle, the largest survivor community, has fallen! It was once a post-apocalyptic ray of hope, but now it has the same tragic fate as other planets. In the midst of the chaos, a small group of survivors managed to escape to this barren wilderness. You are the commander of these survivors. While escaping from the zombie army, you found a strange building protruding from the ground. Shortage of supplies, with no choice, you decide to take refuge in this building. So start your survival battle in this zombie infested world. 【BUILD AND CUSTOMIZE】Expand your shelter with numerous amenities such as satellite connectivity, generators, mission control, etc. Design the layout of the shelter, whichever you prefer! Each hero and survivor has special life skills that help them survive the disaster. From chefs, doctors, engineers to scientists, miners and soldiers, it's up to you to use their skills effectively! [Team Composition and Collaboration] Form a different hero team, each of which has its own unique personality and ability. Develop your favorite team mix to help you overcome even the most daunting situations. [Adventure to the Wild] Get out of the shelter and find valuable resources in the wasteland. Establish camps as forward bases of operations and resource points. But be vigilant! The zombies could attack at any moment! 【Allies with Friends】 It's hard to fight alone, so why not fight with your friends? Join or create an alliance and work with allies to destroy those pesky zombies! Assist allies by accelerating each other's construction and technological research. Either way, it's a win-win situation! Now it's a gamble! Let's go, Commander, and start your adventure!