Mobile game network Heyzap is hoping to attract those burned by OpenFeint's surprise shutdown with a free leaderboard SDK. Its Leaderboards system works cross-platform with iOS and Android, and has a challenge mechanic that sends real-time notifications to other players. The SDK is available publicly today over at the Heyzap website. San Francisco-based Heyzap has been growing in popularity as a mobile game network, having attracted 3,000 game titles to date, according to the company.
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