I'm surprised no one else has done this before, but I made a group called "Halo Custom Games Guild" that works as a community hub for custom games. I myself will not be able to host any because my Gold membership will soon expire, but I figured a lot of you out there would love to. For more details, visit the page linked in the topic, and remember to keep custom games alive!
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It's awesome you're doing this! Wanna play tonight?