Powerball

Built-In Passwords
The passwords are identical for both regions. Passwords only take effect under specific teams.

Unlockable Teams
Do the button codes on the team select screen.

Hidden Text
The following text is found near the beginning of the ROM, right after the ROM header:

[ 1991 NAMCO ALL RIGHTS RESERVED STAFF:MORIWAKI NAKAMURA KAWAMOTO SAITA

The staff list is found only in Powerball; Wrestleball only contains the copyright string.

Region Differences
The main menus are arranged differently. In Wrestleball, you are always asked for a password; in Powerball, you must select LEAGUE CONT. from the main menu to enter a password.

Apart from the display order, team icons, and display names, the region releases have one team difference: while Wrestleball has a Namco team, Powerball has a UK team.

The first animation in the Window Visuals shows a different person in Powerball.