Purchasing a great PC game does not often mean the end of the game. Extra content in the form of mods expand a game beyond its initial remits. Half Life 2 - perhaps the best-paced single player experience still to be had today - flourished with a wonderful modding community (which in fact led to Counter-strike.) The Total War community is particularly rich. Many mods, particularly for Medieval Total War 2(which must be easier to mod), expand the game to the point where it is almost an entirely new game. Two mods which I recommend to my students are the Third Age Mod (Lord of the Rings) and Call of Warhammer (based upon the eponymous fantasy world.) While both are tremendous games in their own right, the lore and background to the worlds are fantastic. Previous attempts to recreate this world...