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The last decade of the 20th century saw gaming transition from being primarily 2D to primarily 3D, a gargantuan paradigm shift that opened up a whole new world of possibilities.

Now that we're almost a quarter of the way through the 21st century, what do you think has been the biggest such shift for gaming since the turn of the millennium? 

It can be a new technology, a new feature, a new way of playing, anything like that. It can also be something that technically existed prior to this century, but didn't take off until this one, similar to how there were 3D games prior to the 90s, but they didn't take over right away.

What's your pick for the biggest step forward, and what makes your choice worthy of the top spot in your opinion?