The year's best-selling game (to date) is also one of the most controversial. Players eagerly awaited the final installment of this action role-playing series, which changes based on a player's actions — but many were upset with the ending. Complaints grew so intense that developer Bioware later announced it would offer a free downloadable content pack to give further clarity to the game's conclusion. Yet the complaints may have piqued interest in the game — and it was the highest profile release of 2012, which was enough to boost its sales ahead of "Modern Warfare 3.”