An alternate reality game (ARG) is an interactive narrative that uses the real world as a platform, often involving multiple media and game elements, to tell a story that may be affected by participants' ideas or actions.
The following ARGs were created to help promote Bungie's games throughout the years and mostly took place on Bungie.net or were made in conjunction with Bungie:
| ARG | Year | For Game |
|---|---|---|
| The Cortana Letters | 1999 | Halo: Combat Evolved |
| Halo Transmissions | 1999 | Halo: Combat Evolved |
| I Love Bees | 2004 | Halo 2 |
| Iris | 2007 | Halo 3 |
| Superintendent | 2008 | Halo 3: ODST |
| Alpha Lupi | 2013 | Destiny |
| Owl Sector | 2016 | Destiny: Rise of Iron |
| Rasputin Chamber | 2018 | Destiny 2: Warmind |
| Shadowkeep | 2019 | Destiny 2: Shadowkeep |
| Corridors of Time | 2020 | Destiny 2: Season of Dawn |
| Beyond Light | 2020 | Destiny 2: Beyond Light |
| Witch Queen | 2022 | Destiny 2: The Witch Queen |
| Announcement | 2023 | Marathon (New) |
| Gameplay Reveal | 2025 | Marathon (New) |
| Chess Puzzle | 2025 | Destiny 2: Episode Heresy |