Play as any character in Grind Square

Finish the game, then load a new game

Cube/Combo

Complete Chapter 1

Play as Garam

To unlock Garam simply complete his challenges.

Play as Goji

To play as Goji, get a JET ranking on all the Grind City levels.

Play as Gum

To unlock Gum simply finish her challenges at the beginging of the game.

Play as Love Shockers, Noise Tanks, Poison Jam, and Goji

Beat the game with a JET ranking in all stages. This includes regular stages as well as Golden Rhino stages

Play as Mew

Beat all the Benten-Cho (aka City of Night) levels with any ranking. After that, Mew will challenge you. Beat the three of her challenges, and she'll join you, allowing you to pick her as playable character.

Play as Poison Jam

To play as Poison Jam, get a JET ranking on all of the Kogane-cho levels.

Tab

Unlock Gum and complete the challenges Tab gives you afterwards.

Unlock Pots, the Dog!

To get to play as Pots, finish the game with the Jet ranking on every level. Every level, meaning both story mode and the basic areas.

Unlock Slate

Play through the game until Slate challenges you to a race in Kogane-Cho. Beat him to unlock.

Yo-Yo

Progress through story mode until he challenges you. Beat his challenge to unlock.

First coat applied (Bronze)

Complete Chapter 1

I got Soul (Gold)

Collect all Graffiti Souls

King of the street (Bronze)

Complete all missions with any rating

Paint the town red (Gold)

Complete Chapter 3

Second coat applied (Silver)

Complete Chapter 2

So creative (Bronze)

Create your own graffiti in all sizes

The gangs all here (Silver)

Unlock all characters

Training wheels (Bronze)

Complete Tutorial

We got us a crew (Bronze)

Unlock Gum and Tab