Three. You'll want to notice the letters coming up with the Zombies. In degree 1 just one letter will come with a Zombie, but the number of letters will increase at greater levels respectively. You have to hit the letters to reduce the zombie. In case you are possessing troubles https://zombie-typing-challenge06036.newbigblog.com/45764925/the-definitive-guide-to-zombie-typing-browser-version