How do you get 10,000 kills fast in left 4 dead 2

Question

I have only like 6,000+
is there any way to get quicky kills?

Answer 1

Play with friends. Play on easy mode.

Answer 2

Play Carnival. Campaign. Easy.

 

Before the safehouse there is a corridor. Use the safehouse as a resupply and 4 medkits. They will respawn down the coordiors, empty your clips and keep at it. You should be fairly well protected from the special infected fairly well down the corridor.