Halo 2 MCC: How to Join the Test Flight
By Andrew Lin

Halo 2 MCC will contain both the classic Halo 2 and Halo 2: Anniversary. The flight is expected to release some time at the end of March.
Halo 2 MCC: Test Flight
Halo 2 is the focus of the next test flight. If you want to participate, you need only sign up for Halo Insider. You'll also need to report the specs of your computer or what version of Xbox One you have. When you take part in the test flights, you basically are play testing a build of the game. The idea is that you help 343 look for bugs in the game before each of the Master Chief Collection parts sees retail.
Halo: Combat Evolved Anniversary has joined Halo: The Master Chief Collection on PC with @XboxGamePassPC, @MicrosoftStore, & @Steam!https://t.co/iUUgn1pYnZ pic.twitter.com/ZrbOL196mO
— Halo (@Halo) March 3, 2020
The original Halo just went live for PC earlier this month, joining Halo Reach as the second installment of The Master Chief Collection. Subsequent releases will go live throughout 2020, with Halo 3, ODST and Halo 4 to come.
You can buy the whole collection for $40 on steam, but you can also buy each individual game for $10 if you're not feeling the whole set.