Balloons vs. Zombies is a physics game with over 20 levels of zombie-killing fun! Try to kill all of the zombies in each level, while making sure not to harm any people. You have two projectiles - knives and balloons! A knife will instantly kill a zombie or person it hits, but is ineffective against wooden objects. Balloons inflate as soon as they hit zombies, people, or wooden objects, and will cause them to float. Your knives and balloons are limited, so think before you use them!