The second instalment of the Halo series hit shelves in 2004. Widely credited with revolutionising the first-person shooter genre, it featured an exhilarating single-player campaign mode and a pioneering multiplayer mode that many successful shooter games went on to emulate.
Nearly two decades after its release, Halo 2 remains the best-selling original Xbox game, with approximately 8.5 million copies sold to date.
Bungie's estimated total expenditure for developing the game ranges from $120 million to $125 million, with a significant portion of this budget allocated to the game's production value. In today's money, that amounts to an impressive $199 million (£158m) to $208 million (£165m).