User blog comment:Destroyerofmw2/Highest K/@comment-D ratio?/@comment-1079585-20100406194511

18 kills, 0 deaths on Hardcore Search on Invasion.

But if you mean with actual deaths, 19 kills and 1 death on Hardcore Search on Highrise. Actually, it might have been 2 deaths, in which case 16 and 1 would be my best.