Microsoft announces the development of Halo 2 as the sequel to the highly successful Halo: Combat Evolved.
Halo 2 is showcased at the Electronic Entertainment Expo (E3) with a highly anticipated reveal trailer, building excitement ahead of the game's release.
Halo 2 is officially released worldwide on the Xbox console, receiving critical acclaim and becoming one of the best-selling games of its generation.
Halo 2 launches with full support for online multiplayer via Xbox Live, revolutionizing console gaming and online multiplayer experience.
The PC version of Halo 2 is released, making the game available to a broader audience beyond the Xbox console.
Human forces, including the UNSC, attempt to retake Installation 05 from the Covenant, a key battle in the Human-Covenant War.
The Arbiter discovers the Tryptich codes that reveal the lies about the Halo Rings and the Prophets' betrayal of the Sangheili.
The Arbiter is sent on a mission to redeem the Sangheili honor and is involved in critical events that redefine the conflict between the Covenant and humanity.
The Flood parasite breaks containment, threatening all life forms on Delta Halo; humanity and Sangheili forces reluctantly cooperate to contain it.
The Master Chief leads a mission to capture or eliminate the Prophet of Regret who escapes to Earth, escalating the war to the human homeworld.
Covenant forces launch an assault on Earth, leading to fierce battles as humanity defends the planet, including key locations such as New Mombasa.
The Arbiter and Master Chief infiltrate the Covenant’s capital city, High Charity, confronting the Gravemind and stopping the Prophets' plans.
The Flood intelligence known as Gravemind reveals the true purpose of the Halos and convinces the Arbiter and Master Chief to join forces.
Master Chief prevents the Prophet of Truth from activating Installation 05’s Halo ring, stopping the mass extinction event.
