The two pieces of downloadable content so far released for Mass Effect 3 have been solid, enjoyable add-ons which follow a traditional formula: a new enemy is causing problems for Commander Shepard on a distant planet and, after a string of firefights, the threat is defeated. There might even be a new weapon or character as a bonus. Previous add-ons Leviathan and Omega were tense, well-constructed side-quests with a hint of expanded mythology that ultimately changed little beyond a few extra ‘War Assets’ – the little-liked number that can influence the overall outcome of the game. By this point almost anyone playing the game has seen the end – and most likely complained about it – so the additional assets are of little consequence. Citadel focuses on something else. Revisiting the Mass Effect universe almost a year to the day since the game’s release was an absolute pleasure and a reminder that, for all the complaining about Bioware’s original ending, the game retains the power to grip your attention.