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The Gentle Physics and Science of Hazardous Materials is not a game per se but more of a piece of software that Konami developed for oil company Idemitsu Kosan in 1990. The Famicom game uses an adapter called the Q-ta to run on the system and was used as a training tool for employees who no doubt thought they got the coolest training tool ever. This collector's item showed up on Yahoo! Auctions in Japan with an opening bid of just ¥1,000 (about $10) and closed at a whopping ¥401,010 (about $4, 213) making it a fairly pricey piece of software.
The Gentle Physics and Science of Hazardous Materials Yahoo! Auctions Japan
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