Microsoft Games has released the Halo PC demo, allowing you to try a singleplayer and a multiplayer level from the sci-fi action game. Here's what the 131mb download includes specifically
In the trial version, you can experience both single and multiplayer gameplay, including limited vehicle combat. In the single player campaign level The Silent Cartographer, you assume the role of super-soldier Master Chief as you take on the fierce alien faction known as the Covenant. In the multiplayer map Blood Gulch, up to 16 human opponents can light each other up with devastating weaponry and combat vehicles, including the new Rocket Warthog and the Banshee, either online or via LAN connection. In Halo related news there is a performance interview with Gearbox's Randy Pitchford on the Adrenaline Vault.