25 Mar 2010 17 Jul 2012
The best way to boost the kills is with two people. Me and safelz got 90-ish kills each in a 30 minute game.
Map: Lab Rats
Meet in the centre chamber and throw a grenade at each other. You both get a kill and it goes pretty quickly. Don't stand to closely or you can kill yourself. Also make sure to throw at the same time or you won't be able to throw your grenade off in time.
It will take a couple games to get to the 90 kills a game but once you do it goes quickly.