Which packaging innovation did Valve introduce in 2009 that revolutionized digital game ownership and presentation?

In the gaming industry, packaging has evolved dramatically from physical boxes to digital storefronts and collector's editions. This unique blend of virtual and physical packaging innovations has created new opportunities for game developers to engage players before they even start the game. Test your knowledge about a revolutionary packaging innovation that transformed how players perceive value in gaming purchases!

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Steam Gift Packaging - allowing digital games to be visually 'wrapped' and given as presents with customized unboxing animations
Collector's Edition Scanner - physical boxes that, when scanned, unlocked exclusive digital content in Steam games
Virtual Shelf System - a 3D interface allowing players to arrange their digital games on customizable virtual bookshelves
Physical-Digital Hybrid Cards - cards sold in retail stores that contained both a download code and augmented reality features