She carries highly sensitive military information, which would prove disastrous if she were captured by the Covenant. John-117 evacuates the doomed ship for the surface of Halo to protect the Autumn's artificial intelligence, Cortana. The main character, Master Chief Petty Officer John-117, is aboard the Pillar of Autumn when the ship comes under attack by the Covenant, an alliance of aliens and the mortal enemies of humanity. UNSC Pillar of Autumn emerges from Slipspace to find a huge ring - a ' Halo' floating in space.

'Destroy Halo before Halo destroys all life in the galaxy.' 'Stage a one-cyborg assault on a Covenant ship and bring back the Captain.' 'Re-activate the weapon at the heart of Halo. 'Fight your way through an ancient security facility in search of the Index.' 'Creep through a swamp to meet the only enemy the Covenant fear.'

'Defend the Control Room against wave after wave of Covenant troops.' 'Search for the map room that will lead you to the secrets of Halo.' 'Board a Covenant ship in an attempt to rescue Captain Keyes.' 'Seek out surviving Marines and help them fight the Covenant.' 'Escape intact as Covenant forces board your ship.'

The Halo: Combat Evolved Campaign consists of 10 levels: The PC version of Halo: Combat Evolved allows only one player to play through the campaign. The Xbox version of Halo: Combat Evolved allows one player to play the campaign alone, as well as two players to play cooperatively in split screen. Halo 's storyline is linear, presented through cut-scenes.

1.3.2 Human colonization of the Orion Arm.

A 10th year edition of the game was released for the Xbox 360 called Halo: Combat Evolved Anniversary on November 15, 2011, precisely 10 years after the original game, and the original Xbox, were released. In June 2012, the game's price was lowered to 800 Microsoft Points. Halo: Combat Evolved has been made available as an Xbox Original game title for the Xbox 360 since Decemfor download on Xbox Live Marketplace for 1200 Microsoft Points. Additionally, it is one of the most popular video games of all time for the original Xbox with five million copies sold, a figure rivaled only by its sequel Halo 2, which achieved eight million sales. It was also released as Halo PC for PC and Mac in 2003.

It was released for the original Xbox game console on November 15, 2001, and is backward compatible with the Xbox 360 by downloading a free code patch on Xbox Live. Halo: Combat Evolved, also known as Halo 1 or Halo: CE, is a First-person shooter science-fiction video game, created by Bungie Studios, which was a subsidiary of Microsoft Game Studios at that time. Sergeant Johnson after the player exits the Halo: Combat Evolved demo.

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