Top iPhone apps: '100 Balls,' 'Piano Tiles,' 'Trivia Crack'

The popularity of sphere-catching game "100 Balls" spreads from the UK to the US, while "Piano Tiles" proves it has a long tail by taking top spot in Australia and Canada. "Fighting Days" is hot on iPhone as well as on iPad in China, while quiz game "Trivia Crack" continues to rule in Brazil.

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