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System 24 version
The US version has a "Winners Don't Use Drugs" screen.
Mega Drive version
The Western versions include a ™ symbol next to the Sega logo.
The story in the opening demo varies by region. In the US ROM version of the game, the scene with the wanted poster is skipped, and Robo and Mobo are hired to test a security system for a mysterious businessman, and looting the businessman's establishments is the method of testing it. In the European ROM, the two are hired to clean up Badville by looting various business establishments for incriminating evidence, just like in the English System 24 version. In the Japanese version, the two are simply criminals who are stealing treasures for their own gain.