Kore ga Pro Yakyuu '90/Hidden content

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Sound test

Choose Pennant Mode and a 130 Days game, then select the Taiyo Whales (sixth team from the left on the top row). At the "Pennant Race" screen, press → 10 times, then HOLD Ⅱ+ SELECT  RUN .

To use the sound test, press ↑ and ↓ to select a sound and Ⅱ to play the selected sound. To exit, reset the system.

View ending

Choose Pennant Mode and a 130 Days game, then select the Taiyo Whales (sixth team from the left on the top row). At the "Pennant Race" screen, press ← 10 times, then HOLD Ⅱ+ SELECT  RUN .

Play as the Monsters

Enter the password screen for the Pennant or VS modes and fill the first 110 spaces with "G", then fill the last 10 spaces with "あ", then select "END".