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"Think breedable Beanie Babies."

So states the FAQ for CryptoKitties, a new game for collecting, breeding and selling digital cats that is so popular, it is clogging up the network of digital currency ethereum.

Players have spent the equivalent of $6.7 million and counting buying CryptoKitties, which can sell for as much as $114,481.59, according to third-party research from developer Niel de la Rouviere. The median price of a kitten is $25.04.

Just three days ago, the site had logged about $1.3 million in sales.

"The popularity of virtual cats fits the euphoria we see elsewhere in the crypto-currency space," Peter Atwater, who studies market sentiment and heads Financial Insyghts, said in an email. "It feels very reminiscent of the Candy Crush craze that helped propel the King Entertainment IPO back at the peak of the 'Unicorn' era in mid 2014."

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