Which major gaming retail acquisition led to the creation of one of the largest digital distribution platforms that now accounts for over 75% of PC game digital sales?

The gaming industry has seen numerous acquisitions and mergers that have reshaped the competitive landscape. One particular acquisition stands out for dramatically altering the balance of power in the gaming retail space and changing how games are distributed and sold. Test your knowledge of this pivotal business move that continues to influence the gaming ecosystem today.

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Microsoft's acquisition of GameStop in 2007
Valve's acquisition of the Steam platform from Sierra Entertainment in 2004
Epic Games' acquisition of GOG.com from CD Projekt in 2011
Sony's acquisition of PlayStation Store from Digital River in 2006