There are a total of six stages in the game, each with their unique boss character.

He opposes you as a boss character at certain points.

He is also the boss character of the game.

The game has an increased difficulty on many stages and includes a new boss character.

After a set number of victories, the player can then compete against a boss character.

However, he also appears as a challenging boss character, to battle against humans.

All three versions allowed the player to control the four boss characters.

At the end when the girl is freed, you have the option to play her against the boss character.

Also, Steel has a "boss" character he must defeat in order for the game to progress.

Your goal is to defeat a single large boss character that has taken over the stage.