The Halo 3: ODST closed beta tests have begun on PC, and if you didn't get into the first wave of the preview test, you should check your email again.

　　343's Tyler Davis wrote on Twitter that the developer has sent out more than 100,000 additional invitations to Halo Insider members on Steam. You can sign up for the free Halo Insider program here. Invitations are sent to the email address tied to the account.

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　　Now Playing: The Evolution Of Halo's Gameplay

　　PSA: Emails for an additional 100k+ Invites are rolling out now to Halo Insiders for Steam. Keep an eye out if you’ve been wanting to get in on the action!

　　— Tyler “Postums” Davis (@343Postums) August 21, 2020

　　This is a normal process for Halo's beta tests on PC for The Master Chief Collection. The tests begin with a limited number of participants before more people are invited in to further test the game at scale.

　　Those invited can try out six campaign missions and seven Firefight maps, plus some of the new changes and improvements coming to the Master Chief Collection, including new weapon skins and guns for Halo 3 some 13 years after the iconic shooter originally launched.

　　A beta test is also available on Xbox One, but it's not clear if that test is being expanded like it is on PC. Whatever the case, the ODST campaign has been available on the Xbox One version of the Master Chief Collection since 2015, but Firefight, the wave-based multiplayer mode, is making its long-awaited debut. Both the campaign and Firefight are heading to PC for the very first time.

　　ODST was originally released back in 2009 for the Xbox 360. Critic Tom McShea awarded it a score of 9/10 in GameSpot's Halo 3: ODST review, saying, "The delicate construction of the story adds a new wrinkle to the typical Halo plot, and the action-packed campaign levels are full of intense battles and surprising encounters. Firefight mode is a standout addition, crafting highly addictive cooperative battles for players to experience."