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The iPhone version of Super Monkey Ball’s sold 300,000 copies in just 20 days reports, The Wall Street Journal.

“That’s a substantial business,” says Simon Jeffery, president of Sega’s US division. “It gives iPhone a justifiable claim to being a viable gaming platform.”

Substantial indeed. According to Steve Jobs, if App Store sales continue at their current rate, Apple will rake in a whopping $360 million a year in new revenue.

More through the link.

By Mike Bowden