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| Best Play Pro Yakyuu
Released in JP: 1989
This game has debugging material.
This game has a hidden sound test.
Choose the first option at the main game menu ("リーグデータ" or "league data") then select the 2nd team name, press A, then edit it to "そのべ" and return to the main menu by pressing B twice. Press Select, Right, Left and a debug menu will appear. You can listen to the game's music, view the ending and other game sequences.