Frickinzombiesio :- Once you start the game, you will find yourself in a place controlled by those freaking zombies. You got it right! It’s your job to kill as many zombies as you can. But again, there are a lot more freaking players who want to take away your stuffs (as loot like in CoC) so in short, the other players are also like zombies for you.
To sum up, you have to kill them all. About the scores, of course, you are awarded 2 points for bringing down a zombie after another player (often called ‘stolen kill’). However, don’t get any scores for killing other players in the arena and for sure, you guys can survive for long if you play together but that’s kinda not possible so it’s all up to you how you play and survive.