Focus Fire

Focus Fire is one of the upgrades available to the character in Mr. Autofire, it increases damage, but only on one target with every bullet that hits the target, due to this, weapons that hit multiple targets do not pair well with this

pairs well with:

Double Barrel

Triple Barrel

Multishot

does not pair well with:

Piercing Shots

Chain Shots

notes:

this can be counted as a anti-boss upgrade, due to the fact that almost every boss is on their own