Welcome to Zombie Survival 2. You have to survive 100 rounds of zombies. Don't worry because every 3 rounds a supply crate comes and gives you things. your guns can be upgraded to flame and knife guns. Walls stop zombies and mines blow up zombies. 1 to select wall click to place. 2 to select mine click to place. (try to place mine in the middle of a lot of zombies to kill them) If the mine randomly blows up it is because of ghost zombies. ghost zombies are invisable, but don't hurt you. there only there to blow up mines. Have FUN