Halo 2 is the sequel to the critically-acclaimed blockbuster Halo: Combat Evolved, and features a newly built game engine, the Havok physics engine middleware, new weapons and vehicles, new multiplayer maps, and a storyline that continues the story begun in Halo: Combat Evolved. Halo 2, released for the Xbox game console on November 9, 2004, and its predecessor are both backwards-compatible for the Xbox 360, including its Xbox Live functionality. A Windows port has recently been announced; this version will be one of the first games to require the Windows Vista operating system.
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Music
The Halo 2 soundtrack was mostly composed by Martin O'Donnell, who had also composed the music of Halo. Steve Vai provided guitar backing for many tracks. Additional tracks were also provided by various outside musicians, such as Joe Satriani (for the remixed theme song, which includes new guitar solos).
The Last Spartan, is the signature theme tune for Halo 2.
The bands Incubus, Breaking Benjamin, and Hoobastank also feature on the official soundtrack and to a certain extent, in the game. The song Blow Me Away is considered the most popular of these contributions, however Incubus's contributions create the mood of the game the best.
Additional content
Xbox Live updates
A common complaint regarding Halo 2's online play has been the widespread cheating which occurred almost immediately upon the game's release. Users exploited bugs in the game and vulnerabilities of the network to win ranked games and thus increase their matchmaking rank. In response to these complaints, Bungie released an automatic update for Halo 2 (a mandatory patch) on Monday, April 18th, 2005, which fixed many of the various bugs and cheats in the game (though some inevitably persist), slimmed down split-screen HUD information, and rebalanced various weapons to promote use of single-wield weapons, grenades, and melee attacks. For example, the melee attacks and grenades are now far more powerful. The battle rifle is now more accurate. A full list of changes can be seen here. This brings Halo 2 up to Version 1.1.
Halo 2 also supports downloadable content, with Bungie making various new multiplayer maps available. Four maps were made available to download on Monday, April 25th, 2005. Two of these were immediately free to download (the "Bonus Pack"), while the other two (the "Killtacular Pack") had a charge attached (US$5.99, £2.99) until July the 5th (in actuality, late June), when they too became free to download. On the 5th, 5 new maps were made available in a pack for $11.99, and were similarly made free to download on August 30th. The Map Pack disk (below) was also released on that date. For further information on the map packs and their contents, see the list of downloadable maps.
Another update was added in July, 2005 (a week or so after the release of the map pack). The update added a detection tool that would automatically detect and ban 'modders' using modified content on their Xboxes. Modified versions of the downloadable maps would allow people to use cheats such as 'super jump' and 'automatic reload' during matches on Xbox Live. Any players who are detected using modified content would be automatically banned from Matchmaking on Xbox Live. The update also fixes a teleporter glitch on the map, Relic.