The new area can be found in the Storage Room, which is accessed from the Science Lab in the basement after collecting 20 time pieces. It is a free roaming chapter where Hat Kid will explore the Metro to find Time Pieces, Flairs, Dyes, Costumes and several other collectables.
Nyakuza Metro is a very large level, akin to the other free-roam level Alpine Skyline, is broken up in several areas which are interconnected by a central hub with distinctions of where the player is by visual cues.
There are four major areas, three stations and one tunnel, each represented by both a color and a unique shape:
The Yellow Overpass Station is designated with yellow overtones and has a circle as its defining shape.
The Green Clean Station has many greens and uses a square as its shape.
The Bluefin Tunnel contains many blues and cyans, as well as having a diamond.
The Pink Paw Station has a pink triangle as its major symbol.
Each Station also contains a Manhole, a place where the player can use their Ice Hat to stomp and access a new part of the metro as a result. As such, all but the Bluefin Tunnel has a manhole, making it the only one of the four to not have two different Time Pieces.
Whatever area Hat Kid is in will be displayed in the top right of the screen, and below that will show the major collectables in that area, such as Time Pieces and Tickets that allow them to enter otherwise restricted areas.
Metro Passes
In order to proceed through the Metro, the player must save up Pons in order to purchase four different Metro Passes. Each Metro Pass unlocks a certain colored gate found throughout the metro, often required in order to progress to the sequential Time Piece. Metro Passes are purchased at Ticket Booths, which are found throughout the metro, selling passes for the station/tunnel they are situated in.
They are also important to the Chapter's finale, Rush Hour, where Hat Kid is chased through various parts of the metro, including requirements of various passes to progress.
Stickers
Stickers are found throughout the metro, able to be picked up and collected for use in pictures, decorating Hat Kid's weapon and communications. By simply walking up to them, they can be either collected, or if on a wall next to a solid floor, fall down and be able to be collected from there.
Each sticker is placed in a predetermined spot, and the player can collect them all by searching around the metro.
Restaurants
Restaurants allow the player to exchange their Pons for consumable foods, which each heal for a single point of health. To further add to this, there are food combinations which allow the player to gain an extra hit point's worth of damage, which lasts for as long as the player does not get hit and stays in the current mission.
Each restaurant in the metro provides a limited and fixed menu of items to select from, with varying prices of each food item to boot.
Gang Sellers
Gang Sellers are a small group of various gang members who serve a role akin to The Badge Seller, where they exchange Pons for Badges. Unlike Badge Seller however, the variety of items is much greater, including virtually all types of customization excluding remixes for Hat Kid to purchase. They are also unique in the fact that each of the many sellers provides a fix set of items, meaning that one gang seller would provide different items from another, and will have only those items to sell until they are purchased.
