At an enlightening 25 minute-long speech today at GDC – one jointly given by Riot Games’ Narrative Lead Tom Abernathy and Microsoft Game Studios’ Design Lead Richard Rouse III – it was noted that many gamers who play even the most story-driven titles don’t actually finish them.

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The Walking Dead: Season 1, Episode 1 - 66%

- 66% Mass Effect 2 - 56%

- 56% BioShock Infinite - 53%

- 53% Batman: Arkham City - 47%

- 47% Portal - 47%

- 47% Mass Effect 3 - 42%

- 42% The Walking Dead: Season 1, Episode 5 - 39%

- 39% The Elder Scrolls V: Skyrim - 32%

- 32% Borderlands 2 - 30%

The speech, called “Death to the Three-Act Structure,” elaborated on game completion with some interesting statistics from Valve, based wholly on Steam Achievements. The percentages associated with the titles below represent how many players completed the game in question on Steam.“Statistically, most players don’t finish games. We’ve all seen numbers that say something like a third [do finish games], on average," Rouse III said later in the presentation.Do these findings surprise you? Which of these games did you finish all the way through, and which did you abandon?

Colin Moriarty is IGN’s Senior Editor. You can follow him on Twitter.