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Make Them Work for It: Designing Achievements for Your Games

http://gamedev.tutsplus.com/articles/game-design-articles/make-them-work-for-it-designing-achievements-for-your-games/

Happy New Year! We're kicking off 2013 with a look at in-game achievements and how to design them - seems appropriate, given how many people are making New Year's Resolutions today :)
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