They are, beyond control schemes and visuals, the single best reason to play games on a PC. Mods can, at their laziest, tweak a game so its settings or features behave more to your liking. At their most ambitious, they can transform your entire experience, leaving you with something that feels like an all-new game.
This year was a big one for PC mods, with two - DayZ and Black Mesa - rivalling commercial products for public awareness and, perhaps more importantly, quality. But they weren't the only great mods released this year, here's a shortlist of the best mods released during 2012.