Campaign

Template:Ratings Campaign Mode is the single player gaming aspect of Halo: Combat Evolved, Halo 2, Halo 3, Halo 3: ODST, Halo wars and Halo:Reach, where the player takes control of a single character at a time through the canonical storyline of the Halo trilogy, and the single player aspect of Halo Wars, where the player takes control of an entire UNSC Army force.

Description

In Halo: Combat Evolved and Halo 3 the player plays as John-117 or Master Chief, in Halo 2 the player plays as both Master Chief and the Arbiter Thel 'Vadam a Covenant Elite, which allows the player a more personal view on Covenant society.

In Halo Wars, the campaign has a different gaming aspect. The game is a strategy video game, and the player takes control of a whole base, troops and vehicles. It is up to him to decide where a squad will go, when a building will be constructed e.g. Again, the game follows the canonical storyline of the Halo Universe.

It can be played on four difficulty levels, listed in order from most difficult to the easiest: Legendary, Heroic, Normal, and Easy. In addition, Halo: CE and Halo 2 have a co-op Campaign option permitting two players to play through campaign either in split-screen or via system link between two Xbox Gaming Consoles. For Halo 3 the number of players permitted has changed to allow up to four players and the use of Xbox Live.

Halo 3 also has a unique, unofficial difficulty known to fans. One of them is Mythic, Legendary with all Skulls activated.

Halo: Combat Evolved Campaign Levels

Halo 2 Campaign Levels

The Heretic (Cutscene Only) (Non-playable) (Solo)
The Armory (Tutorial) (Solo)
Cairo Station
Outskirts
Metropolis
The Arbiter
The Oracle
Delta Halo
Regret
Sacred Icon
Quarantine Zone
Gravemind
Uprising
High Charity
The Great Journey

Halo 3 Campaign Levels

A walkthrough for some of these levels (and a few others) can be found here.

Arrival (Cutscene Only) (Non-playable) Tutorial (Only in Easy and Normal)
Sierra 117
Crow's Nest
Tsavo Highway
The Storm
Floodgate
The Ark
The Covenant
Cortana
Halo

Halo Wars Campaign Levels

Halo 3: ODST Campaign levels

Trivia

All of the trilogy games end with Master Chief in space with some kind of transport. In Halo: Combat Evolved, he is in a Longsword. In Halo 2, he is in the Forerunner Dreadnought. In Halo 3, he is stranded in the remains of the UNSC Frigate, Forward Unto Dawn, which is drifting in an unknown part of space.
Halo: Combat Evolved starts with Master Chief leaving a cryo pod and Halo 3 ends with him entering one again.
In Halo: Combat Evolved, Halo 2, and Halo 3: ODST; when the game transitions from cutscene to gameplay, it would fade to white. In Halo 3 and Halo Wars the transitions would fade to black.
In every game the Master Chief falls unconscious. In Halo: Combat Evolved, he is unconscious after the escape pod crashes at the beginning of the level Halo. In Halo 2, he is knocked out when the Pelican crashes on Outskirts. In Halo 3, he is unconscious at the beginning of Sierra 117 where he lands on the ground after leaving the Forerunner Dreadnought. Similarly, in Halo 3:ODST, the Rookie is knocked unconscious upon landing.
In Halo: Combat Evolved, Halo 3 and Halo Wars, the endings of the three games end with an explosion: Halo: CE ends with Halo Installation 04 exploding, Halo 3 ends with Halo Installation 04B exploding, and Halo Wars ends with a Shield World exploding.
In Halo 2 and Halo 3: ODST, the endings of the two games end with a large battle: Halo 2 ends with a battle with the Brute Chieftain Tartarus, while Halo 3: ODST ends with a large battle with Covenant.
In the Halo Trilogy, as well as Halo 3: ODST, the main character performs some sort of a drop towards the beginning of the game. In Halo: CE the Master Chief crashed onto Halo in an evac pod. In Halo 2 he jumps from the Cairo station to destroy a Covenant Assault Carrier. In Halo 3 he falls from the Dreadnought in the opening cutscene, and in ODST the Rookie takes part in a combat drop into New Mombasa.

Sources