This game has hidden developer credits.
Shout Match is an RPG in which you defeat your enemies via the power of screaming, even coming with a handy microphone peripheral for such an arduous task.
...or you can just use the spacebar if you don't want to embarrass yourself.
At the very beginning of the ROM data is a series of credits alongside a build date:
Shout Match 87/3/22 programed byH.YamazakiSpecial thanks for T.Ishizawa & J.Okuse