Halo Alpha
Halo Alpha

Defense of CASTLE Base is the second campaign level in the Halo Interactive Strategy Game.

Features: John-117, Three Marines, The Arbiter, three Unggoy, two Sangheili, and two Jiralhanae.

(Multiplayer includes three blue Spartans)

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Castle Base On Reach


This level takes place in CASTLE Base, on planet Reach, during a Covenant assault and the Covenant attempt to steal Earth's coordinates. It was said that this particular level was going to be part of a level in Halo Reach but was scrapped for some unknown reason.


  • UNSC Forces: Eliminate all Covenant attackers in CASTLE Base.
  • Covenant Forces: Enter CASTLE Base and steal the data packet containing Earth's coordinates.

Next Level: The Hidden Artifact of Reach