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As you know in the beginning levels 1-5 or whatever u knife zombies to get better and more points.(You May Know This Already so no negativity)Well What i suggest in place of knifing the zombie to death is, to shoot the zombie the max amount of times before killing it.Heres a List
Round 1: Shoot 4 times then knife the zombie
Round 2: Shoot 7 times then knife the zombie
Round 3: Shoot 11 times then knife the zombie
Round 4: Shoot 18 times then knife the zombie
Round 5: Shoot 26 times then knife the zombie
I don't know if this is useful to any of u but it's useful to me when i have more points then most so thank me if this helped as i just started posting threads.

+rep also if ur kind enough