The team at 343 has been working to address the multitude of issues plaguing Halo: The Master Chief Collection's matchmaking, announcing that the Halo 2 Anniversary Rumble playlist is now available.
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The playlist was originally available in the game, but was removed to simplify the troubled matchmaking system. It's now back by community request, partially because it's not affected by the party-splitting and uneven teams issue because it's a free-for-all mode.
"Based on community feedback we've received since yesterday's update, we are bringing the Halo 2: Anniversary Rumble playlist, which features a variety of FFA game types, back into the matchmaking rotation," the Halo Waypoint post states. "Our team continues to work on resolving existing matchmaking issues such as party splitting and uneven teams, and in the meantime, this playlist will offer a mix of game types that are not affected by these known issues."
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A later update yesterday announced that the playlist is now live after having been tested, and will offer 10 player max and no rankings. The team plans to reduce the max number of players to eight and add ranks once the matchmaking problems are sorted out.
Those issues are very much still affecting the game--searching for a match can take an extremely long time, and disconnects and uneven teams are way too common. Another patch for matchmaking can't come soon enough, and it will hopefully fix the problems this time around.