Smoke is the boss counter. For the big gunner going up the building it's smoke, shoot, smoke, advance while shooting. This usually gets him in 2-3 shots unless he sees you. The knife guy in the basement won't heal if he can't see you. Shield guy sometimes dies in 1 shot if he can't see you even from the front (requires the armor piercing perk). If you're lucky he'll throw a molotov when you drop in, which drops his shield allowing a 1 shot with killing spree up.
Doing the basement last is faster even with the backtrack from the right side of the screen because getting back up is painfully slow.
To anyone interested in submitting a run, at least one mod (Wavuvi) is checking for new runs multiple times a week. Remember to jump cancel your shotgun slowdown and turn off ALL skills (including team) for fresh runs!
