Heating Up Mafia Town is Act 6 of the first Chapter: Mafia Town. Hat Kid must turn off all 6 lava faucets by hitting the lever 3 times with her umbrella and use the cannon to reach the top to collect the Time Piece. It contains multiple parkour sections.
When the player starts the level, they will immediately talk to the Goofy Mafia member where he claims that he saw Moustache Girl turn on all the faucets, pouring lava all over Mafia Town. in order for Hat Kid to complete the act, she needs to turn off all faucets.
After she turns off all faucets, she will need to go into the cannon that launches her to Mafia HQ, the Goofy Mafia and other cheering Mafia Goons will congratulate Hat Kid in her success, and then will give her a Time Piece.
"Heating Up Mafia" takes place in Mafia Town, which is a wide open location with many items to collect. While this version of it is not identical to other acts in this chapter, it is close enough that if you wish to know what collectables can be found here, please consult this section of the Mafia Town page. Check here for achievements.
After each mission Hat Kid will write about it in her diary, which can be found in her room under the swimming pool of pillows. The diary will only read the entry for the last act that was completed.
"It’s… so.. HOT! Something seriously wrong has happened to the island; it looks like a huge Volcano went off!
"The Mafia guys are too big and tough to admit it, but the heat is definitely getting to them. Mafia guys get way smelly when they sweat… well, way smellier."
- In Prototype this Act was called "Mafia on Fire"
- In Prototype Thor was going to inform you about the Lava. Later Thor was replaced by Goofy Mafia