Ex characters
In arcade mode level 100+, Ex characters will challenge
you. Defeat them to unlock them.
Leopaldon
In arcade mode level 199, defeat Leopaldon to unlock him.
Zako 1, 2, and 3
In GGBoost, defeat Kakusei Sol and Ky in the last stage
to unlock them.
Kakusei Sol and Kakusei Ky
Play Scramble in RK II Factory under the normal difficulty
setting. Finish the last stage with a score of 1,500,000 or greater.
Robo Ky II Substance will appear. Defeat him to unlock Kakusei
Sol and Kakusei Ky.