Chapter 3 is The Sewers. The Chapter 3 update notes say it opens after you escape Chapter 2 once on any difficulty. The 8 November 2026 experience blurb still tells you to fight the rat bosses, beat The Rat King for the key, clear the junk, and ride the wave out.
Gear before the Rat Lair
Punch underground brick, sell rubble at the crusher, and buy Fight Gear before the lair. The notes name three Fight Gear rows: Gloves, Health, and Armor. These Gloves are a sewer combat purchase. They are not the same as the gem gloves used for skins. No price or stat table is published, so read the board in the sewer shop.
Two team tools arrive with this chapter:
- Water Cannon: press F to blast a large chunk of wall at once.
- Bubble Blaster: powers up the whole team. No percentage is published.
New helpers named in the same notes are Bandit the Raccoon and his cubs, Chompers the Croc, and Flicker the Firefly Medic. Flicker is named as a medic. A heal amount is not published.
Rat Lair order
- Fight through 3 Rat Mini-Bosses. Their individual names are not published.
- Fight The Rat King. Watch for red telegraphed attack marks and dodge them.
- Defeat The Rat King to claim the Sea Gate Key.
- Clear the Great Clog with your crew.
- Escape out to the open sea.
Room order, exact enemy positions, and drop tables beyond the key are not in the notes. The official one-line summary matches that route: rat bosses, the key, clear the junk, ride the wave.
Insane on this chapter
The same notes add Insane on every chapter that existed then. Escape that chapter on Hard to unlock Insane for it. The written modifiers are an escape wall twice as far, and rats that attack faster and hit harder. The Chapter 4 blurb still offers Insane and does not restate those modifiers.
The notes also say the update added full translation for 17 languages. They do not list the language names.
If you wipe
A wipe on the mini-bosses means the key was not claimed. The Great Clog is a crew step after the key, so a solo player who cannot clear the clog should use Find Match rather than assuming the key is enough by itself. The notes say to team up for that clog.