Build barricades to isolate the zombies so they cannot reach you, to accomplish your mission of fight and rescue. A complex interface allows you to select the best kind of barricade and build better weapons and supplies for the fight. You can also hire mercenaries that will support you in combat. The game includes 2 modes: in the STORY MODE you advance through many stages and can save the game to continue later from the current point. In the SURVIVAL MODE you have to last as long as possible.
Use the W-A-S-D keys to move, the space bar to jump and the 1-2-3-4 keys to switch weapons. Move the mouse to aim, click to shoot. Use the I key to show/hide the inventory; E key to fix the barricade that you have built. The right bar shows the barricades that you can buy, and an icon that you can use to destroy those you don't need anymore. To move a barricade to the center of the scene, drag and drop it from the right bar to the point where you want to place it. At the shop you can buy new weapons (use the mouse to do it). The inventory will show you the objects and weapons you have. To hire a mercenary, click at him and then use the mouse to indicate him if he has to follow you or just stay at a fixed place.