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Sega Master System[edit]
The original version, upon which all details in this guide are based.
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SMS round screenshot
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SMS boss screenshot
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Japanese SMS box
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European SMS box
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American SMS box
Arcade[edit]
Heavily based on the Sega Master System version, it changes things just slightly by removing the health meter and adding a timer. This means one hit by any enemy or bullet will kill Opa Opa immediately. Any time left over after defeating a boss is converted into money.
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Arcade round screenshot
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Arcade boss screenshot
Famicom[edit]
Converted for play on the Famicom by Sunsoft. Plays very similar, albeit slightly slower, and with fewer on-screen colors.
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Famicom round screenshot
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Famicom boss screenshot
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Famicom box
MSX[edit]
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MSX round screenshot
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MSX boss screenshot
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MSX box
