Yesterday, Microsoft surprised 360 owners when they announced and released the original Doom on to the Xbox Live Marketplace. But as usual, it was not released without some upgrades.

The Xbox Live Arcade download consists of the entire single player campaign (four episodes), four-player co-op and Deathmatch (both either on Xbox Live or via Splitscreen), and as with all arcade downloads, the game has the usual achievements, matchmaking, and leaderboards. Doom also supports 1080i and 5.1 surround sound along with some minor graphical upgrades to smooth things out.

Doom is available right now as an arcade download for 800 Microsoft Points (equivalent to $10). It is 22 MB in size.

Look for more information on the game when we get the section added to the site.