GAOGAO! is an eroge game series developed and published by Four-Nine (フォア・ナイン ) for PC-98.

There are four installments, the latter three being post-apocalyptic:

• GaoGao! 1st: Radical Sequence (1994)
• GaoGao! 2nd: Pandora no Mori (1994)
• GaoGao! 3rd: Wild Force (1994)
• GaoGao! 4th: Canaan - Yakusoku no Chi (1997)

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