Internal testing of Halo 2 and Halo 2 begins today.
343 announced this week Those parts of the Insider program will be able to test the following: Halo 2 with Halo 2nd Anniversary Applicable to Master Chief Collection, and started on PC today.
If you are part of the Halo Insider program, you can use the new version. If you are not an Insider and want to test it and the upcoming Halo title, you can register here.
PSA: All the third ring closure procedures for Halo 2 and Halo 2: Anniversary have been resolved. The flight will start on Friday, April 17th. When the invite button is pressed, we will notify people. Stay tuned for tactical marines!
-Tyler "Postums" Davis (@ 343Postums) April 16, 2020
Last month, after the end of the test, "Halo: Anniversary of the Evolution of Battle Masters" was released in "Halo: Master Collection". It is available via Steam, Xbox Game Pass for PC and Windows 10.
Currently, it also includes Halo: Reach, and the remaining titles will be automatically updated throughout the year when they are available.