District 3 is called Manaus and is much of the same as Districts 1 and 2. There are 12 jobs and no paths or Boss Fights. We also don't see any stamina jobs in Brazil.
The next property called the Black Market property will unlock after the first job is mastered.
One job requires a consumable item and it's the Button Camera you made in District 2.
One job produces a consumable item called the Radio Phone. We sure do have a lot of phones in this game!
2 jobs require Real for every click.
Once you master all the jobs on the Bronze Level, you get the mastery item and the next District unlocks. The mastery item is a Camp Knife and will give you a 5% boost in robbing defense. This will increase with mastery.