Installation 01 is an upcoming fan-made first-person shooter video game based on the Halo series, developed by Soon Studios (previously known as The Installation 01 Team) for Microsoft Windows, macOS, and Linux operating systems in Unreal Engine 5.

Installation 01 is a fan-made, multiplayer-only[1] project originally designed in Unity for Microsoft Windows, macOS, and Linux by Soon Studios.

[9] In May, a cinematic trailer was released,[1] which featured character and weapons models based on Halo 3 designs.

[12] In November 2023, an early development post was made on Twitter, showcasing a playtest in Unreal Engine 5.

[13][16] He elaborates that they will never accept donations, or sell Installation 01 or Halo related merchandise as to keep a respectful distance between the studio and Microsoft's intellectual property.

He also notes that these rules and assurances from Microsoft are specific to Installation 01 as a project, and do not apply elsewhere.