8. Assassin's Creed

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Even from the start, trailers for Assassin's Creed featured odd digital artifacts that didn't quite fit in, but from all we could see, the game was a historical take on the open-world genre. And this fantastic trailer drummed up early enthusiasm for the series opener, spotlighted its many innovations like the free running, crowd movement, and hidden blade mechanics.

But one thing it conveniently forgets to mention? Ah, right, the fact that the entire game takes place within the DNA-embedded memories of a near-future descendant of the playable hero, who is strapped to a sleek machine called the Animus. It made for a nice mystery, at least.