In Pictures: OS X Mountain Lion arrives - the top 25 features

Apple's latest OS X version amps up the iOS integration, but offers much more for business and personal use

Compete with your friends

iOS 5 introduced the Game Center app last year, whch lets you track your scores and compare them to friends' performance using leaderboards and other "gamification" scoring mechanisms. Game Center comes to OS X Mountain Lion, so you can keep up on the competition when you've put your iPad, iPhone, or iPod Touch down.

And OS X's ancient Chess app is now Game Center-compatible, so you can compete over chess, too.

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