Super Volleyball (Genesis)

Production Credits
In the Japanese version, enter a password of すたっふ ("staff" in hiragana) to pull up a credits roll. The credits, transcribed to English are:
 * Program: Masahiko Tsukada (Micronics)
 * Design: Shinsuke Nakamura, Shouko Ishimoto
 * Ongaku (Music): Kenji Okuda, Naoki Itamura
 * Assistant: Tetsuya Kuroda (Micronics)

Secret Team?
In the Japanese version, use password うらわざ ("urawaza", which roughly means "cheat") to play against a "??? Team".